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1. Sensitivity of K$\beta$ mainline X-ray emission to structural dynamics in iron photosensitizer

Author

Rogvall, Johanna, Singh, Roshan, Vacher, Morgane, and Lundberg, Marcus

Subjects
Physics - Chemical Physics
Abstract

Photochemistry and photophysics processes involve structures far from equilibrium. In these reactions, there is often strong coupling between nuclear and electronic degrees of freedom. For first-row transition metals, K$\beta$ X-ray emission spectroscopy (XES) is a sensitive probe of electronic structure due to the direct overlap between the valence orbitals and the 3p hole in the final state. Here the sensitivity of K$\beta$ mainline (K$\beta$1,3) XES to structural dynamics is analyzed by simulating spectral changes along the excited state dynamics of an iron photosensitizer [FeII(bmip)2]2+ [bmip = 2,6-bis(3-methyl-imidazole-1-ylidine)-pyridine], using both restricted active space (RAS) multiconfigurational wavefunction theory and a one-electron orbital-energy approach in density-functional theory (1-DFT). Both methods predict a spectral blue-shift with increasing metal-ligand distance, which changes the emission intensity for any given detection energy. These results support the suggestion that the [FeII(bmip)2]2+ femtosecond K$\beta$ XES signal shows oscillations due to coherent wavepacket dynamics. Based on the RAS results, the sensitivity to structural dynamics is twice as high for K$\beta$ compared to K$\alpha$, with the drawback of a lower signal-to-noise ratio. K$\beta$ sensitivity is favored by a larger spectral blue-shift with increasing metal-ligand distance and larger changes in spectral shape. Comparing the two simulations methods, 1-DFT predicts smaller energy shifts and lower sensitivity, likely due to missing final-state effects. The simulations can be used to design and interpret XES probes of non-equilibrium structures to gain mechanistic insights in photocatalysis.

Published
2024
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4. Origin of vibrational wavepacket dynamics in Fe carbene photosensitizer determined with femtosecond X-ray emission and scattering

Author

Kunnus, Kristjan, Vacher, Morgane, Harlang, Tobias C. B., Kjær, Kasper S., Haldrup, Kristoffer, Biasin, Elisa, van Driel, Tim B., Pápa, Mátyás, Chabera, Pavel, Liu, Yizhu, Tatsuno, Hideyuki, Timm, Cornelia, Källman, Erik, Delcey, Mickaël, Hartsock, Robert W., Reinhard, Marco E., Koroidov, Sergey, Laursen, Mads G., Hansen, Frederik B., Vester, Peter, Christensen, Morten, Sandberg, Lise, Németh, Zoltán, Szemes, Dorottya Sárosiné, Bajnóczi, Éva, Alonso-Mori, Roberto, Glownia, James M., Nelson, Silke, Sikorski, Marcin, Sokaras, Dimosthenis, Lemke, Henrik T., Canton, Sophie, Møller, Klaus B., Nielsen, Martin M., Vankó, György, Wärnmark, Kenneth, Sundström, Villy, Persson, Petter, Lundberg, Marcus, Uhlig, Jens, and Gaffney, Kelly J.

Subjects
Physics - Chemical Physics
Abstract

Disentangling the dynamics of electrons and nuclei during nonadiabatic molecular transformations remains a considerable experimental challenge. Here we have investigated photoinduced electron transfer dynamics following a metal-to-ligand charge-transfer (MLCT) excitation of the [Fe(bmip)2]2+ photosensitizer, where bmip = 2,6-bis(3-methyl-imidazole-1- ylidine)-pyridine, with simultaneous femtosecond-resolution Fe K{\alpha} and K\b{eta} X-ray Emission Spectroscopy (XES) and Wide Angle X-ray Scattering (WAXS). This measurement clearly shows temporal oscillations in the XES and WAXS difference signals with the same 278 fs period oscillation. The oscillatory signal originates from an Fe-ligand stretching mode vibrational wavepacket on a triplet metal-centered (3MC) excited state surface. The vibrational wavepacket is created by 40% of the excited population that undergoes electron transfer from the non-equilibrium MLCT excited state to the 3MC excited state with a 110 fs time constant, while the other 60% relaxes to a 3MLCT excited state in parallel. The sensitivity of the K{\alpha} XES spectrum to molecular structure results from core-level vibronic coupling, due to a 0.7% average Fe-ligand bond length difference in the lowest energy geometry of the 1s and 2p core-ionized states. These results highlight the importance of vibronic effects in time-resolved XES experiments and demonstrate the role of metal-centered excited states in the electronic excited state relaxation dynamics of an Fe carbene photosensitizer.

Published
2019
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5. Dvala

Author

Lundberg, Marcus

Abstract

This music score was submitted for the Kaleidoscope 2020 Call for Scores, an open access collaboration with the UCLA Music Library.

Published
2020

6. På återseende

Author

Lundberg, Marcus

Abstract

This music score was submitted for the Kaleidoscope 2020 Call for Scores, an open access collaboration with the UCLA Music Library.

Published
2020

7. Ankomst

Author

Lundberg, Marcus

Abstract

This music score was submitted for the Kaleidoscope 2020 Call for Scores, an open access collaboration with the UCLA Music Library.

Published
2020

8. Working as Partners: Course Development by a Student--Teacher Team

Author

Bengtson, Charlotta, Ahlkvist, Mikaela, Ekeroth, William, Nilsen-Moe, Astrid, Vedin, Nathalie Proos, Rodiuchkina, Katerina, Ye, Sofie, and Lundberg, Marcus

Abstract

A first-year undergraduate course at Uppsala University has been redesigned in a process exploring different levels of student participation. In the first part of the project, the student voice was heard through interviews focusing on the role of the course in the degree program. In the second part, a student-teacher team was formed to develop course curriculum and teaching material in partnership. Among the implemented changes were new seminars focusing on conceptual understanding, redesign of all lectures to include active student participation, and a change of the course literature. The redesigned course significantly increased student satisfaction compared to previous years. Important success factors were involvement of the student organization to promote the project, institutional support, early selection of concrete development tasks, and allowing team members to choose what they wanted to develop according to their own expertise.

Published
2017

9. Implementation of the exact semi-classical light-matter interaction - the easy way

Author

Sørensen, Lasse Kragh, Kieri, Emil, Srivastav, Shruti, Lundberg, Marcus, and Lindh, Roland

Subjects
Physics - Chemical Physics, Physics - Computational Physics
Abstract

We present an analytical and numerical solution of the calculation of the transition moments for the exact semi-classical light-matter interaction for wavefunctions expanded in a Gaussian basis. By a simple manipulation we show that the exact semi-classical light-matter interaction of a plane wave can be compared to a Fourier transformation of a Gaussian where analytical recursive formulas are well known and hence making the difficulty in the implementation of the exact semi-classical light-matter interaction comparable to the transition dipole. Since the evaluation of the analytical expression involves a new Gaussian we instead have chosen to evaluate the integrals using a standard Gau{\ss}-Hermite quadrature since this is faster. A brief discussion of the numerical advantages of the exact semi-classical light-matter interaction in comparison to the multipole expansion along with the unphysical interpretation of the multipole expansion is discussed. Numerical examples on [CuCl$_4$]$^{2-}$ to show that the usual features of the multipole expansion is immediately visible also for the exact semi-classical light-matter interaction and that this can be used to distinguish between symmetries. Calculation on [FeCl$_4$]$^{1-}$ is presented to demonstrate the better numerical stability with respect to the choice of basis set in comparison to the multipole expansion and finally Fe-O-Fe to show origin independence is a given for the exact operator. The implementation is freely available in OpenMolcas., Comment: 22 pages, 4 figures

Published
2018
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10. Probing the oxidation state of transition metal complexes: a case study on how charge and spin densities determine Mn L-edge X-ray absorption energies.

Author

Kubin, Markus, Guo, Meiyuan, Kroll, Thomas, Löchel, Heike, Källman, Erik, Baker, Michael L, Mitzner, Rolf, Gul, Sheraz, Kern, Jan, Föhlisch, Alexander, Erko, Alexei, Bergmann, Uwe, Yachandra, Vittal, Yano, Junko, Lundberg, Marcus, and Wernet, Philippe

Subjects
Chemical Sciences
Abstract

Transition metals in inorganic systems and metalloproteins can occur in different oxidation states, which makes them ideal redox-active catalysts. To gain a mechanistic understanding of the catalytic reactions, knowledge of the oxidation state of the active metals, ideally in operando, is therefore critical. L-edge X-ray absorption spectroscopy (XAS) is a powerful technique that is frequently used to infer the oxidation state via a distinct blue shift of L-edge absorption energies with increasing oxidation state. A unified description accounting for quantum-chemical notions whereupon oxidation does not occur locally on the metal but on the whole molecule and the basic understanding that L-edge XAS probes the electronic structure locally at the metal has been missing to date. Here we quantify how charge and spin densities change at the metal and throughout the molecule for both redox and core-excitation processes. We explain the origin of the L-edge XAS shift between the high-spin complexes MnII(acac)2 and MnIII(acac)3 as representative model systems and use ab initio theory to uncouple effects of oxidation-state changes from geometric effects. The shift reflects an increased electron affinity of MnIII in the core-excited states compared to the ground state due to a contraction of the Mn 3d shell upon core-excitation with accompanied changes in the classical Coulomb interactions. This new picture quantifies how the metal-centered core hole probes changes in formal oxidation state and encloses and substantiates earlier explanations. The approach is broadly applicable to mechanistic studies of redox-catalytic reactions in molecular systems where charge and spin localization/delocalization determine reaction pathways.

Published
2018

11. Cr L‑Edge X‑ray Absorption Spectroscopy of CrIII(acac)3 in Solution with Measured and Calculated Absolute Absorption Cross Sections

Author

Kubin, Markus, Guo, Meiyuan, Ekimova, Maria, Källman, Erik, Kern, Jan, Yachandra, Vittal K, Yano, Junko, Nibbering, Erik TJ, Lundberg, Marcus, and Wernet, Philippe

Subjects
Inorganic Chemistry, Chemical Sciences, Physical Sciences, Chromium, Coordination Complexes, Manganese, Solutions, X-Ray Absorption Spectroscopy, Engineering, Chemical sciences, Physical sciences
Abstract

X-ray absorption spectroscopy at the L-edge of 3d transition metals is widely used for probing the valence electronic structure at the metal site via 2p-3d transitions. Assessing the information contained in L-edge absorption spectra requires systematic comparison of experiment and theory. We here investigate the Cr L-edge absorption spectrum of high-spin chromium acetylacetonate CrIII(acac)3 in solution. Using a transmission flatjet enables determining absolute absorption cross sections and spectra free from X-ray-induced sample damage. We address the challenges of measuring Cr L absorption edges spectrally close to the O K absorption edge of the solvent. We critically assess how experimental absorption cross sections can be used to extract information on the electronic structure of the studied system by comparing our results of this CrIII (3d3) complex to our previous work on L-edge absorption cross sections of MnIII(acac)3 (3d4) and MnII(acac)2 (3d5). Considering our experimental uncertainties, the most insightful experimental observable for this d3(CrIII)-d4(MnIII)-d5(MnII) series is the L-edge branching ratio, and we discuss it in comparison to semiempirical multiplet theory and ab initio restricted active space calculations. We further discuss and analyze trends in integrated absorption cross sections and correlate the spectral shapes with the local electronic structure at the metal sites.

Published
2018

12. X-ray-induced sample damage at the Mn L-edge: a case study for soft X-ray spectroscopy of transition metal complexes in solution

Author

Kubin, Markus, Kern, Jan, Guo, Meiyuan, Källman, Erik, Mitzner, Rolf, Yachandra, Vittal K, Lundberg, Marcus, Yano, Junko, and Wernet, Philippe

Subjects
Inorganic Chemistry, Chemical Sciences, Physical Sciences, Chemical Physics
Abstract

X-ray induced sample damage can impede electronic and structural investigations of radiation-sensitive samples studied with X-rays. Here we quantify dose-dependent sample damage to the prototypical MnIII(acac)3 complex in solution and at room temperature for the soft X-ray range, using X-ray absorption spectroscopy at the Mn L-edge. We observe the appearance of a reduced MnII species as the X-ray dose is increased. We find a half-damage dose of 1.6 MGy and quantify a spectroscopically tolerable dose on the order of 0.3 MGy (1 Gy = 1 J kg-1), where 90% of MnIII(acac)3 are intact. Our dose-limit is around one order of magnitude lower than the Henderson limit (half-damage dose of 20 MGy) which is commonly employed for protein crystallography with hard X-rays. It is comparable, however, to the dose-limits obtained for collecting un-damaged Mn K-edge spectra of the photosystem II protein, using hard X-rays. The dose-dependent reduction of MnIII observed here for solution samples occurs at a dose limit that is two to four orders of magnitude smaller than the dose limits previously reported for soft X-ray spectroscopy of iron samples in the solid phase. We compare our measured to calculated spectra from ab initio restricted active space (RAS) theory and discuss possible mechanisms for the observed dose-dependent damage of MnIII(acac)3 in solution. On the basis of our results, we assess the influence of sample damage in other experimental studies with soft X-rays from storage-ring synchrotron radiation sources and X-ray free-electron lasers.

Published
2018

13. Direct Determination of Absolute Absorption Cross Sections at the L‑Edge of Dilute Mn Complexes in Solution Using a Transmission Flatjet

Author

Kubin, Markus, Guo, Meiyuan, Ekimova, Maria, Baker, Michael L, Kroll, Thomas, Källman, Erik, Kern, Jan, Yachandra, Vittal K, Yano, Junko, Nibbering, Erik TJ, Lundberg, Marcus, and Wernet, Philippe

Subjects
Inorganic Chemistry, Chemical Sciences, Physical Chemistry, Physical Chemistry (incl. Structural), Other Chemical Sciences, Inorganic & Nuclear Chemistry, Inorganic chemistry, Macromolecular and materials chemistry
Abstract

The 3d transition metals play a pivotal role in many charge transfer processes in catalysis and biology. X-ray absorption spectroscopy at the L-edge of metal sites probes metal 2p-3d excitations, providing key access to their valence electronic structure, which is crucial for understanding these processes. We report L-edge absorption spectra of MnII(acac)2 and MnIII(acac)3 complexes in solution, utilizing a liquid flatjet for X-ray absorption spectroscopy in transmission mode. With this, we derive absolute absorption cross-sections for the L-edge transitions with peak magnitudes as large as 12 and 9 Mb for MnII(acac)2 and MnIII(acac)3, respectively. We provide insight into the electronic structure with ab initio restricted active space calculations of these L-edge transitions, reproducing the experimental spectra with excellent agreement in terms of shapes, relative energies, and relative intensities for the two complexes. Crystal field multiplet theory is used to assign spectral features in terms of the electronic structure. Comparison to charge transfer multiplet calculations reveals the importance of charge transfer in the core-excited final states. On the basis of our experimental observations, we extrapolate the feasibility of 3d transition metal L-edge absorption spectroscopy using the liquid flatjet approach in probing highly dilute biological solution samples and possible extensions to table-top soft X-ray sources.

Published
2018

14. Culture of engagement

Author

Fransén, Lina, primary, Hellgren, Victor, additional, Mortensen, Magnus, additional, Olsson, Susanna, additional, Proos Vedin, Nathalie, additional, Elmgren, Maja, additional, Lundberg, Marcus, additional, and Kotronia, Antonia, additional

Published
2024
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16. What do we approximate and what are the consequences in perturbation theory?

Author

Sørensen, Lasse Kragh, Lindh, Roland, and Lundberg, Marcus

Subjects
Physics - Chemical Physics, Physics - Computational Physics
Abstract

We present a discussion of the consequences in perturbation theory when an exact eigenfunctions and eigenvalues to to the zeroth order Hamiltonian $H_0$ cannot be found. Since the usual approximations such as projecting the wavefunction on to a finite basis set and restricting the particle interaction is a way of constructing an approximate zeroth order Hamiltonian $H_0'$ we will here argue that the exact eigenfunctions and eigenvalues are always found for $H_0'$. We will show that as long as the perturbative expansion does not depend on any intrinsic properties of $H_0$ but only on knowing the exact eigenfunctions and eigenvalues then any perturbative statement, such as origin independence intensities, will be true for any $H_0'$ provided that $H_0'$ has a spectrum. We will use this to show that the origin independence for the intensities is trivially fulfilled in the velocity gauge but also can be fulfilled exactly in the length gauge if an appropriate $H_0$ is chosen. Finally a small numerically demonstration of the origin dependence of the terms for the second-order intensities in both the length and velocity gauge is undertaking to numerically illustrate the theoretical statements., Comment: 13 pages, 3 figures

Published
2016

17. 2p x-ray absorption spectroscopy of 3d transition metal systems

Author

de Groot, Frank M.F., Elnaggar, Hebatalla, Frati, Federica, Wang, Ru-pan, Delgado-Jaime, Mario U., van Veenendaal, Michel, Fernandez-Rodriguez, Javier, Haverkort, Maurits W., Green, Robert J., van der Laan, Gerrit, Kvashnin, Yaroslav, Hariki, Atsushi, Ikeno, Hidekazu, Ramanantoanina, Harry, Daul, Claude, Delley, Bernard, Odelius, Michael, Lundberg, Marcus, Kuhn, Oliver, Bokarev, Sergey I., Shirley, Eric, Vinson, John, Gilmore, Keith, Stener, Mauro, Fronzoni, Giovanna, Decleva, Piero, Kruger, Peter, Retegan, Marius, Joly, Yves, Vorwerk, Christian, Draxl, Claudia, Rehr, John, and Tanaka, Arata

Published
2021
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18. Effect of a short compulsory course on teachers’ active learning practices.

Author

Andreasen, Katarina, Lundberg, Marcus, Pålsson, Stefan, and Timneanu, Nicusor

Subjects
*ACTIVE learning, *TEACHERS, *DIRECT instruction, *STUDENT surveys, *TEACHER training
Abstract

We investigated the impact that teachers’ participation in a short compulsory course on active learning had on their teaching practice. The course was offered at all departments of a STEM faculty with a total of 516 participants. Evaluations showed that teachers especially appreciated collegial discussions and examples of teaching practices in the course. In a survey, 64% indicated the course had led them to implement active teaching. Comparing large-scale pre-course and post-course student surveys with up to 2389 individual responses revealed a significant increase in the number of courses with active learning. The course as a change strategy contains aspects of both middle-out and top-down approaches and organising the course at departments, enables movement from individual to structural level. [ABSTRACT FROM AUTHOR]

Published
2024
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22. The OpenMolcas Web: A Community-Driven Approach to Advancing Computational Chemistry

Author

Fundación la Caixa, European Commission, Ministerio de Ciencia e Innovación (España), Department of Energy (US), Swiss National Science Foundation, Ministero dell'Istruzione, dell'Università e della Ricerca, Carl Trygger Foundation, Royal Society (UK), Independent Research Fund Denmark, German Research Foundation, Generalitat de Catalunya, Olle Engkvist Foundation, National Centre for Research and Development (Poland), National Science Foundation (US), Academy of Finland, Knut and Alice Wallenberg Foundation, Swedish Research Council, Université de Nantes, Japan Society for the Promotion of Science, Università degli Studi di Siena, Novo Nordisk Foundation, Argonne National Laboratory (US), National University of Singapore, Air Force Office of Scientific Research (US), Linköping University, Centre National de la Recherche Scientifique (France), Li Manni, Giovanni [0000-0002-3666-3880], Fdez Galván, Ignacio [0000-0002-0684-7689], #NODATA#, Aleotti, Flavia [0000-0002-7176-5305], Aquilante, Francesco [0000-0003-4422-3938], Autschbach, Jochen [0000-0001-9392-877X], Avagliano, Davide [0000-0001-5539-9731], Baiardi, Alberto [0000-0001-9112-8664], Bao, Jie J. [0000-0003-0197-3405], Battaglia, Stefano [0000-0002-5082-2681], Blanco-González, Alejandro [0000-0001-7379-2588], Bokarev, Sergey I. [0000-0003-0779-5013], Broer, Ria [0000-0002-5437-9509], Cacciari, Roberto [0000-0001-8290-4297], Calio, Paul B. [0000-0001-8385-2628], Carlson, Rebecca K. [0000-0002-1710-5816], Carvalho Couto, Rafael [0000-0003-4020-0923], Cerdán, L. [0000-0002-7174-2453], Chibotaru, Liviu F. [0000-0003-1556-0812], Chilton, Nicholas F. [0000-0002-8604-0171], Church, Jonathan Richard [0000-0001-5986-1305], Conti, Irene [0000-0001-7982-4480], Coriani, Sonia [0000-0002-4487-897X], Cuéllar-Zuquin, Juliana [0000-0002-0127-579X], Daoud, Razan E. [0000-0001-7034-0770], Dattani, Nike [0000-0001-5667-3632], Decleva, Piero [0000-0002-7322-887X], de Graaf, Coen [0000-0001-8114-6658], Delcey, Mickaël G. [0000-0001-9883-3569], De Vico, Luca [0000-0002-2821-5711], Dobrautz, Werner [0000-0001-6479-1874], Dong, Sijia S. [0000-0001-8182-6522], Feng, Rulin [0000-0002-9812-3804], Ferré, Nicolas [0000-0002-5583-8834], Filatov Gulak, Michael [0000-0002-1541-739X], Gagliardi, Laura [0000-0001-5227-1396], Garavelli, Marco [0000-0002-0796-289X], González, Leticia [0000-0001-5112-794X], Guo, Meiyuan [0000-0003-2474-6264], Hennefarth, Matthew R. [0000-0002-6601-2253], Hermes, Matthew R. [0000-0001-7807-2950], Huix-Rotllant, Miquel [0000-0002-2131-7328], Jaiswal, Vishal Kumar [0000-0002-5090-7984], Kaliakin, Danil S. [0000-0002-9354-8248], King, Daniel S. [0000-0003-0208-5274], Larsson, Ernst D. [0000-0001-7655-2993], Lehtola, Susi [0000-0001-6296-8103], Lepetit, Marie-Bernadette [0000-0001-8730-4282], Lischka, Hans [0000-0002-5656-3975], Lundberg, Marcus [0000-0002-1312-1202], Mai, Sebastian [0000-0001-5327-8880], Marquetand, Philipp [0000-0002-8711-1533], Merritt, Isabella C. D. [0000-0002-7965-7798], Nenov, Artur [0000-0003-3071-5341], Nguyen, Vu Ha Anh [0000-0002-4177-0656], Nishimoto, Yoshio [0000-0001-5581-4712], Oakley, Meagan S. [0000-0001-5072-7572], Olivucci, Massimo [0000-0002-8247-209X], Oppel, Markus [0000-0001-6363-2310], Padula, Daniele [0000-0002-7171-7928], Pandharkar, Riddhish [0000-0003-4086-4308], Phung, Quan Manh [0000-0001-8205-5328], Plasser, Felix [0000-0003-0751-148X], Reiher, Markus [0000-0002-9508-1565], Rivalta, Ivan [0000-0002-1208-602X], Roca-Sanjuán, Daniel [0000-0001-6495-2770], Romig, Thies [0000-0002-9424-2398], Safari, Arta Anushirwan [0000-0003-4511-8902], Sánchez-Mansilla, Aitor [0000-0002-2601-190X], Sand, Andrew M. [0000-0002-7166-2066], Schapiro, Igor [0000-0001-8536-6869], Scott, Thais R. [0000-0002-5746-5517], Segarra-Martí, Javier [0000-0002-2076-3406], Segatta, Francesco [0000-0003-4150-6676], Sergentu, Dumitru-Claudiu [0000-0001-6570-5245], Shepard, Ron [0000-0002-0272-0824], Shu, Yinan [0000-0002-8371-0221], Sørensen, Lasse Kragh [0000-0002-1931-1867], Tenorio, Bruno Nunes Cabral [0000-0002-9702-998X], Truhlar, Donald G. [0000-0002-7742-7294], Ungur, Liviu [0000-0001-5015-4225], Vacher, Morgane [0000-0001-9418-6579], Veryazov, Valera [0000-0002-0172-7047], Li Manni, Giovanni, Fdez Galván, Ignacio, Alavi, Ali, Aleotti, Flavia, Aquilante, Francesco, Autschbach, Jochen, Avagliano, Davide, Baiardi, Alberto, Bao, Jie J., Battaglia, Stefano, Birnoschi, Letitia, Blanco-González, Alejandro, Bokarev, Sergey I., Broer, Ria, Cacciari, Roberto, Calio, Paul B., Carlson, Rebecca K., Carvalho Couto, Rafael, Cerdán, L., Chibotaru, Liviu F., Chilton, Nicholas F., Church, Jonathan Richard, Conti, Irene, Coriani, Sonia, Cuéllar-Zuquin, Juliana, Daoud, Razan E., Dattani, Nike, Decleva, Piero, de Graaf, Coen, Delcey, Mickaël G., De Vico, Luca, Dobrautz, Werner, Dong, Sijia S., Feng, Rulin, Ferré, Nicolas, Filatov Gulak, Michael, Gagliardi, Laura, Garavelli, Marco, González, Leticia, Guan, Yafu, Guo, Meiyuan, Hennefarth, Matthew R., Hermes, Matthew R., Hoyer, Chad E., Huix-Rotllant, Miquel, Jaiswal, Vishal Kumar, Kaiser, Andy, Kaliakin, Danil S., Khamesian, Marjan, King, Daniel S., Kochetov, Vladislav, Krośnicki, Marek, Kumaar, Arpit Arun, Larsson, Ernst D., Lehtola, Susi, Lepetit, Marie-Bernadette, Lischka, Hans, López Ríos, Pablo, Lundberg, Marcus, Ma, Dongxia, Mai, Sebastian, Marquetand, Philipp, Merritt, Isabella C. D., Montorsi, Francesco, Mörchen, Maximilian, Nenov, Artur, Nguyen, Vu Ha Anh, Nishimoto, Yoshio, Oakley, Meagan S., Olivucci, Massimo, Oppel, Markus, Padula, Daniele, Pandharkar, Riddhish, Phung, Quan Manh, Plasser, Felix, Raggi, Gerardo, Rebolini, Elisa, Reiher, Markus, Rivalta, Ivan, Roca-Sanjuán, Daniel, Romig, Thies, Safari, Arta Anushirwan, Sánchez-Mansilla, Aitor, Sand, Andrew M., Schapiro, Igor, Scott, Thais R., Segarra-Martí, Javier, Segatta, Francesco, Sergentu, Dumitru-Claudiu, Sharma, Prachi, Shepard, Ron, Shu, Yinan, Staab, Jakob K., Straatsma, Tjerk P., Sørensen, Lasse Kragh, Tenorio, Bruno Nunes Cabral, Truhlar, Donald G., Ungur, Liviu, Vacher, Morgane, Veryazov, Valera, Voß, Torben Arne, Weser, Oskar, Wu, Dihua, Yang, Xuchun, Yarkony, David, Zhou, Chen, Zobel, J Patrick, Lindh, Roland, Fundación la Caixa, European Commission, Ministerio de Ciencia e Innovación (España), Department of Energy (US), Swiss National Science Foundation, Ministero dell'Istruzione, dell'Università e della Ricerca, Carl Trygger Foundation, Royal Society (UK), Independent Research Fund Denmark, German Research Foundation, Generalitat de Catalunya, Olle Engkvist Foundation, National Centre for Research and Development (Poland), National Science Foundation (US), Academy of Finland, Knut and Alice Wallenberg Foundation, Swedish Research Council, Université de Nantes, Japan Society for the Promotion of Science, Università degli Studi di Siena, Novo Nordisk Foundation, Argonne National Laboratory (US), National University of Singapore, Air Force Office of Scientific Research (US), Linköping University, Centre National de la Recherche Scientifique (France), Li Manni, Giovanni [0000-0002-3666-3880], Fdez Galván, Ignacio [0000-0002-0684-7689], #NODATA#, Aleotti, Flavia [0000-0002-7176-5305], Aquilante, Francesco [0000-0003-4422-3938], Autschbach, Jochen [0000-0001-9392-877X], Avagliano, Davide [0000-0001-5539-9731], Baiardi, Alberto [0000-0001-9112-8664], Bao, Jie J. [0000-0003-0197-3405], Battaglia, Stefano [0000-0002-5082-2681], Blanco-González, Alejandro [0000-0001-7379-2588], Bokarev, Sergey I. [0000-0003-0779-5013], Broer, Ria [0000-0002-5437-9509], Cacciari, Roberto [0000-0001-8290-4297], Calio, Paul B. [0000-0001-8385-2628], Carlson, Rebecca K. [0000-0002-1710-5816], Carvalho Couto, Rafael [0000-0003-4020-0923], Cerdán, L. [0000-0002-7174-2453], Chibotaru, Liviu F. [0000-0003-1556-0812], Chilton, Nicholas F. [0000-0002-8604-0171], Church, Jonathan Richard [0000-0001-5986-1305], Conti, Irene [0000-0001-7982-4480], Coriani, Sonia [0000-0002-4487-897X], Cuéllar-Zuquin, Juliana [0000-0002-0127-579X], Daoud, Razan E. [0000-0001-7034-0770], Dattani, Nike [0000-0001-5667-3632], Decleva, Piero [0000-0002-7322-887X], de Graaf, Coen [0000-0001-8114-6658], Delcey, Mickaël G. [0000-0001-9883-3569], De Vico, Luca [0000-0002-2821-5711], Dobrautz, Werner [0000-0001-6479-1874], Dong, Sijia S. [0000-0001-8182-6522], Feng, Rulin [0000-0002-9812-3804], Ferré, Nicolas [0000-0002-5583-8834], Filatov Gulak, Michael [0000-0002-1541-739X], Gagliardi, Laura [0000-0001-5227-1396], Garavelli, Marco [0000-0002-0796-289X], González, Leticia [0000-0001-5112-794X], Guo, Meiyuan [0000-0003-2474-6264], Hennefarth, Matthew R. [0000-0002-6601-2253], Hermes, Matthew R. [0000-0001-7807-2950], Huix-Rotllant, Miquel [0000-0002-2131-7328], Jaiswal, Vishal Kumar [0000-0002-5090-7984], Kaliakin, Danil S. [0000-0002-9354-8248], King, Daniel S. [0000-0003-0208-5274], Larsson, Ernst D. [0000-0001-7655-2993], Lehtola, Susi [0000-0001-6296-8103], Lepetit, Marie-Bernadette [0000-0001-8730-4282], Lischka, Hans [0000-0002-5656-3975], Lundberg, Marcus [0000-0002-1312-1202], Mai, Sebastian [0000-0001-5327-8880], Marquetand, Philipp [0000-0002-8711-1533], Merritt, Isabella C. D. [0000-0002-7965-7798], Nenov, Artur [0000-0003-3071-5341], Nguyen, Vu Ha Anh [0000-0002-4177-0656], Nishimoto, Yoshio [0000-0001-5581-4712], Oakley, Meagan S. [0000-0001-5072-7572], Olivucci, Massimo [0000-0002-8247-209X], Oppel, Markus [0000-0001-6363-2310], Padula, Daniele [0000-0002-7171-7928], Pandharkar, Riddhish [0000-0003-4086-4308], Phung, Quan Manh [0000-0001-8205-5328], Plasser, Felix [0000-0003-0751-148X], Reiher, Markus [0000-0002-9508-1565], Rivalta, Ivan [0000-0002-1208-602X], Roca-Sanjuán, Daniel [0000-0001-6495-2770], Romig, Thies [0000-0002-9424-2398], Safari, Arta Anushirwan [0000-0003-4511-8902], Sánchez-Mansilla, Aitor [0000-0002-2601-190X], Sand, Andrew M. [0000-0002-7166-2066], Schapiro, Igor [0000-0001-8536-6869], Scott, Thais R. [0000-0002-5746-5517], Segarra-Martí, Javier [0000-0002-2076-3406], Segatta, Francesco [0000-0003-4150-6676], Sergentu, Dumitru-Claudiu [0000-0001-6570-5245], Shepard, Ron [0000-0002-0272-0824], Shu, Yinan [0000-0002-8371-0221], Sørensen, Lasse Kragh [0000-0002-1931-1867], Tenorio, Bruno Nunes Cabral [0000-0002-9702-998X], Truhlar, Donald G. [0000-0002-7742-7294], Ungur, Liviu [0000-0001-5015-4225], Vacher, Morgane [0000-0001-9418-6579], Veryazov, Valera [0000-0002-0172-7047], Li Manni, Giovanni, Fdez Galván, Ignacio, Alavi, Ali, Aleotti, Flavia, Aquilante, Francesco, Autschbach, Jochen, Avagliano, Davide, Baiardi, Alberto, Bao, Jie J., Battaglia, Stefano, Birnoschi, Letitia, Blanco-González, Alejandro, Bokarev, Sergey I., Broer, Ria, Cacciari, Roberto, Calio, Paul B., Carlson, Rebecca K., Carvalho Couto, Rafael, Cerdán, L., Chibotaru, Liviu F., Chilton, Nicholas F., Church, Jonathan Richard, Conti, Irene, Coriani, Sonia, Cuéllar-Zuquin, Juliana, Daoud, Razan E., Dattani, Nike, Decleva, Piero, de Graaf, Coen, Delcey, Mickaël G., De Vico, Luca, Dobrautz, Werner, Dong, Sijia S., Feng, Rulin, Ferré, Nicolas, Filatov Gulak, Michael, Gagliardi, Laura, Garavelli, Marco, González, Leticia, Guan, Yafu, Guo, Meiyuan, Hennefarth, Matthew R., Hermes, Matthew R., Hoyer, Chad E., Huix-Rotllant, Miquel, Jaiswal, Vishal Kumar, Kaiser, Andy, Kaliakin, Danil S., Khamesian, Marjan, King, Daniel S., Kochetov, Vladislav, Krośnicki, Marek, Kumaar, Arpit Arun, Larsson, Ernst D., Lehtola, Susi, Lepetit, Marie-Bernadette, Lischka, Hans, López Ríos, Pablo, Lundberg, Marcus, Ma, Dongxia, Mai, Sebastian, Marquetand, Philipp, Merritt, Isabella C. D., Montorsi, Francesco, Mörchen, Maximilian, Nenov, Artur, Nguyen, Vu Ha Anh, Nishimoto, Yoshio, Oakley, Meagan S., Olivucci, Massimo, Oppel, Markus, Padula, Daniele, Pandharkar, Riddhish, Phung, Quan Manh, Plasser, Felix, Raggi, Gerardo, Rebolini, Elisa, Reiher, Markus, Rivalta, Ivan, Roca-Sanjuán, Daniel, Romig, Thies, Safari, Arta Anushirwan, Sánchez-Mansilla, Aitor, Sand, Andrew M., Schapiro, Igor, Scott, Thais R., Segarra-Martí, Javier, Segatta, Francesco, Sergentu, Dumitru-Claudiu, Sharma, Prachi, Shepard, Ron, Shu, Yinan, Staab, Jakob K., Straatsma, Tjerk P., Sørensen, Lasse Kragh, Tenorio, Bruno Nunes Cabral, Truhlar, Donald G., Ungur, Liviu, Vacher, Morgane, Veryazov, Valera, Voß, Torben Arne, Weser, Oskar, Wu, Dihua, Yang, Xuchun, Yarkony, David, Zhou, Chen, Zobel, J Patrick, and Lindh, Roland

Abstract

The developments of the open-source OpenMolcas chemistry software environment since spring 2020 are described, with a focus on novel functionalities accessible in the stable branch of the package or via interfaces with other packages. These developments span a wide range of topics in computational chemistry and are presented in thematic sections: electronic structure theory, electronic spectroscopy simulations, analytic gradients and molecular structure optimizations, ab initio molecular dynamics, and other new features. This report offers an overview of the chemical phenomena and processes OpenMolcas can address, while showing that OpenMolcas is an attractive platform for state-of-the-art atomistic computer simulations.

Published
2023

25. Vibrational wavepacket dynamics in Fe carbene photosensitizer determined with femtosecond X-ray emission and scattering

Author

Kunnus, Kristjan, Vacher, Morgane, Harlang, Tobias C. B., Kjær, Kasper S., Haldrup, Kristoffer, Biasin, Elisa, van Driel, Tim B., Pápai, Mátyás, Chabera, Pavel, Liu, Yizhu, Tatsuno, Hideyuki, Timm, Cornelia, Källman, Erik, Delcey, Mickaël, Hartsock, Robert W., Reinhard, Marco E., Koroidov, Sergey, Laursen, Mads G., Hansen, Frederik B., Vester, Peter, Christensen, Morten, Sandberg, Lise, Németh, Zoltán, Szemes, Dorottya Sárosiné, Bajnóczi, Éva, Alonso-Mori, Roberto, Glownia, James M., Nelson, Silke, Sikorski, Marcin, Sokaras, Dimosthenis, Lemke, Henrik T., Canton, Sophie E., Møller, Klaus B., Nielsen, Martin M., Vankó, György, Wärnmark, Kenneth, Sundström, Villy, Persson, Petter, Lundberg, Marcus, Uhlig, Jens, and Gaffney, Kelly J.

Published
2020
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29. The OpenMolcas Web: A Community-Driven Approach to Advancing Computational Chemistry

Author

Li Manni, Giovanni, primary, Fdez. Galván, Ignacio, additional, Alavi, Ali, additional, Aleotti, Flavia, additional, Aquilante, Francesco, additional, Autschbach, Jochen, additional, Avagliano, Davide, additional, Baiardi, Alberto, additional, Bao, Jie J., additional, Battaglia, Stefano, additional, Birnoschi, Letitia, additional, Blanco-González, Alejandro, additional, Bokarev, Sergey I., additional, Broer, Ria, additional, Cacciari, Roberto, additional, Calio, Paul B., additional, Carlson, Rebecca K., additional, Carvalho Couto, Rafael, additional, Cerdán, Luis, additional, Chibotaru, Liviu F., additional, Chilton, Nicholas F., additional, Church, Jonathan Richard, additional, Conti, Irene, additional, Coriani, Sonia, additional, Cuéllar-Zuquin, Juliana, additional, Daoud, Razan E., additional, Dattani, Nike, additional, Decleva, Piero, additional, de Graaf, Coen, additional, Delcey, Mickaël G., additional, De Vico, Luca, additional, Dobrautz, Werner, additional, Dong, Sijia S., additional, Feng, Rulin, additional, Ferré, Nicolas, additional, Filatov(Gulak), Michael, additional, Gagliardi, Laura, additional, Garavelli, Marco, additional, González, Leticia, additional, Guan, Yafu, additional, Guo, Meiyuan, additional, Hennefarth, Matthew R., additional, Hermes, Matthew R., additional, Hoyer, Chad E., additional, Huix-Rotllant, Miquel, additional, Jaiswal, Vishal Kumar, additional, Kaiser, Andy, additional, Kaliakin, Danil S., additional, Khamesian, Marjan, additional, King, Daniel S., additional, Kochetov, Vladislav, additional, Krośnicki, Marek, additional, Kumaar, Arpit Arun, additional, Larsson, Ernst D., additional, Lehtola, Susi, additional, Lepetit, Marie-Bernadette, additional, Lischka, Hans, additional, López Ríos, Pablo, additional, Lundberg, Marcus, additional, Ma, Dongxia, additional, Mai, Sebastian, additional, Marquetand, Philipp, additional, Merritt, Isabella C. D., additional, Montorsi, Francesco, additional, Mörchen, Maximilian, additional, Nenov, Artur, additional, Nguyen, Vu Ha Anh, additional, Nishimoto, Yoshio, additional, Oakley, Meagan S., additional, Olivucci, Massimo, additional, Oppel, Markus, additional, Padula, Daniele, additional, Pandharkar, Riddhish, additional, Phung, Quan Manh, additional, Plasser, Felix, additional, Raggi, Gerardo, additional, Rebolini, Elisa, additional, Reiher, Markus, additional, Rivalta, Ivan, additional, Roca-Sanjuán, Daniel, additional, Romig, Thies, additional, Safari, Arta Anushirwan, additional, Sánchez-Mansilla, Aitor, additional, Sand, Andrew M., additional, Schapiro, Igor, additional, Scott, Thais R., additional, Segarra-Martí, Javier, additional, Segatta, Francesco, additional, Sergentu, Dumitru-Claudiu, additional, Sharma, Prachi, additional, Shepard, Ron, additional, Shu, Yinan, additional, Staab, Jakob K., additional, Straatsma, Tjerk P., additional, Sørensen, Lasse Kragh, additional, Tenorio, Bruno Nunes Cabral, additional, Truhlar, Donald G., additional, Ungur, Liviu, additional, Vacher, Morgane, additional, Veryazov, Valera, additional, Voß, Torben Arne, additional, Weser, Oskar, additional, Wu, Dihua, additional, Yang, Xuchun, additional, Yarkony, David, additional, Zhou, Chen, additional, Zobel, J. Patrick, additional, and Lindh, Roland, additional

Published
2023
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30. Electronic Structure of the Complete Series of Gas-Phase Manganese Acetylacetonates by X-ray Absorption Spectroscopy

Author

Ablyasova, Olesya S., Guo, Meiyuan, Zamudio-Bayer, Vicente, Kubin, Markus, Gitzinger, Tim, da Silva Santos, Mayara, Flach, Max, Timm, Martin, Lundberg, Marcus, Lau, J. Tobias, Hirsch, Konstantin, Ablyasova, Olesya S., Guo, Meiyuan, Zamudio-Bayer, Vicente, Kubin, Markus, Gitzinger, Tim, da Silva Santos, Mayara, Flach, Max, Timm, Martin, Lundberg, Marcus, Lau, J. Tobias, and Hirsch, Konstantin

Abstract

Metal centers in transition metal–ligand complexes occur in a variety of oxidation states causing their redox activity and therefore making them relevant for applications in physics and chemistry. The electronic state of these complexes can be studied by X-ray absorption spectroscopy, which is, however, due to the complex spectral signature not always straightforward. Here, we study the electronic structure of gas-phase cationic manganese acetylacetonate complexes Mn(acac)1–3+ using X-ray absorption spectroscopy at the metal center and ligand constituents. The spectra are well reproduced by multiconfigurational wave function theory, time-dependent density functional theory as well as parameterized crystal field and charge transfer multiplet simulations. This enables us to get detailed insights into the electronic structure of ground-state Mn(acac)1–3+ and extract empirical parameters such as crystal field strength and exchange coupling from X-ray excitation at both the metal and ligand sites. By comparison to X-ray absorption spectra of neutral, solvated Mn(acac)2,3 complexes, we also show that the effect of coordination on the L3 excitation energy, routinely used to identify oxidation states, can contribute about 40–50% to the observed shift, which for the current study is 1.9 eV per oxidation state.

Published
2023
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31. The OpenMolcas Web : A Community-Driven Approach to Advancing Computational Chemistry

Author

Manni, Giovanni Li, Fernández Galván, Ignacio, Alavi, Ali, Aleotti, Flavia, Aquilante, Francesco, Autschbach, Jochen, Avagliano, Davide, Baiardi, Alberto, Bao, Jie J., Battaglia, Stefano, Birnoschi, Letitia, Blanco-Gonzalez, Alejandro, Bokarev, Sergey I., Broer, Ria, Cacciari, Roberto, Calio, Paul B., Carlson, Rebecca K., Couto, Rafael Carvalho, Cerdan, Luis, Chibotaru, Liviu F., Chilton, Nicholas F., Church, Jonathan Richard, Conti, Irene, Coriani, Sonia, Cuellar-Zuquin, Juliana, Daoud, Razan E., Dattani, Nike, Decleva, Piero, de Graaf, Coen, Delcey, Mickael G., De Vico, Luca, Dobrautz, Werner, Dong, Sijia S., Feng, Rulin, Ferre, Nicolas, Filatov (Gulak), Michael, Gagliardi, Laura, Garavelli, Marco, Gonzalez, Leticia, Guan, Yafu, Guo, Meiyuan, Hennefarth, Matthew R., Hermes, Matthew R., Hoyer, Chad E., Huix-Rotllant, Miquel, Jaiswal, Vishal Kumar, Kaiser, Andy, Kaliakin, Danil S., Khamesian, Marjan, King, Daniel S., Kochetov, Vladislav, Krosnicki, Marek, Kumaar, Arpit Arun, Larsson, Ernst D., Lehtola, Susi, Lepetit, Marie-Bernadette, Lischka, Hans, Rios, Pablo Lopez, Lundberg, Marcus, Ma, Dongxia, Mai, Sebastian, Marquetand, Philipp, Merritt, Isabella C. D., Montorsi, Francesco, Morchen, Maximilian, Nenov, Artur, Nguyen, Vu Ha Anh, Nishimoto, Yoshio, Oakley, Meagan S., Olivucci, Massimo, Oppel, Markus, Padula, Daniele, Pandharkar, Riddhish, Phung, Quan Manh, Plasser, Felix, Raggi, Gerardo, Rebolini, Elisa, Reiher, Markus, Rivalta, Ivan, Roca-Sanjuan, Daniel, Romig, Thies, Safari, Arta Anushirwan, Sanchez-Mansilla, Aitor, Sand, Andrew M., Schapiro, Igor, Scott, Thais R., Segarra-Marti, Javier, Segatta, Francesco, Sergentu, Dumitru-Claudiu, Sharma, Prachi, Shepard, Ron, Shu, Yinan, Staab, Jakob K., Straatsma, Tjerk P., Sorensen, Lasse Kragh, Tenorio, Bruno Nunes Cabral, Truhlar, Donald G., Ungur, Liviu, Vacher, Morgane, Veryazov, Valera, Voss, Torben Arne, Weser, Oskar, Wu, Dihua, Yang, Xuchun, Yarkony, David, Zhou, Chen, Zobel, J. Patrick, Lindh, Roland, Manni, Giovanni Li, Fernández Galván, Ignacio, Alavi, Ali, Aleotti, Flavia, Aquilante, Francesco, Autschbach, Jochen, Avagliano, Davide, Baiardi, Alberto, Bao, Jie J., Battaglia, Stefano, Birnoschi, Letitia, Blanco-Gonzalez, Alejandro, Bokarev, Sergey I., Broer, Ria, Cacciari, Roberto, Calio, Paul B., Carlson, Rebecca K., Couto, Rafael Carvalho, Cerdan, Luis, Chibotaru, Liviu F., Chilton, Nicholas F., Church, Jonathan Richard, Conti, Irene, Coriani, Sonia, Cuellar-Zuquin, Juliana, Daoud, Razan E., Dattani, Nike, Decleva, Piero, de Graaf, Coen, Delcey, Mickael G., De Vico, Luca, Dobrautz, Werner, Dong, Sijia S., Feng, Rulin, Ferre, Nicolas, Filatov (Gulak), Michael, Gagliardi, Laura, Garavelli, Marco, Gonzalez, Leticia, Guan, Yafu, Guo, Meiyuan, Hennefarth, Matthew R., Hermes, Matthew R., Hoyer, Chad E., Huix-Rotllant, Miquel, Jaiswal, Vishal Kumar, Kaiser, Andy, Kaliakin, Danil S., Khamesian, Marjan, King, Daniel S., Kochetov, Vladislav, Krosnicki, Marek, Kumaar, Arpit Arun, Larsson, Ernst D., Lehtola, Susi, Lepetit, Marie-Bernadette, Lischka, Hans, Rios, Pablo Lopez, Lundberg, Marcus, Ma, Dongxia, Mai, Sebastian, Marquetand, Philipp, Merritt, Isabella C. D., Montorsi, Francesco, Morchen, Maximilian, Nenov, Artur, Nguyen, Vu Ha Anh, Nishimoto, Yoshio, Oakley, Meagan S., Olivucci, Massimo, Oppel, Markus, Padula, Daniele, Pandharkar, Riddhish, Phung, Quan Manh, Plasser, Felix, Raggi, Gerardo, Rebolini, Elisa, Reiher, Markus, Rivalta, Ivan, Roca-Sanjuan, Daniel, Romig, Thies, Safari, Arta Anushirwan, Sanchez-Mansilla, Aitor, Sand, Andrew M., Schapiro, Igor, Scott, Thais R., Segarra-Marti, Javier, Segatta, Francesco, Sergentu, Dumitru-Claudiu, Sharma, Prachi, Shepard, Ron, Shu, Yinan, Staab, Jakob K., Straatsma, Tjerk P., Sorensen, Lasse Kragh, Tenorio, Bruno Nunes Cabral, Truhlar, Donald G., Ungur, Liviu, Vacher, Morgane, Veryazov, Valera, Voss, Torben Arne, Weser, Oskar, Wu, Dihua, Yang, Xuchun, Yarkony, David, Zhou, Chen, Zobel, J. Patrick, and Lindh, Roland

Abstract

The developments of the open-source OpenMolcas chemistry software environment since spring 2020 are described, with a focus on novel functionalities accessible in the stable branch of the package or via interfaces with other packages. These developments span a wide range of topics in computational chemistry and are presented in thematic sections: electronic structure theory, electronic spectroscopy simulations, analytic gradients and molecular structure optimizations, ab initio molecular dynamics, and other new features. This report offers an overview of the chemical phenomena and processes OpenMolcas can address, while showing that OpenMolcas is an attractive platform for state-of-the-art atomistic computer simulations.

Published
2023
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32. Sensitivity of K beta mainline X-ray emission to structural dynamics in iron photosensitizer

Author

Rogvall, Johanna, Singh, Roshan, Vacher, Morgane, Lundberg, Marcus, Rogvall, Johanna, Singh, Roshan, Vacher, Morgane, and Lundberg, Marcus

Abstract

Photochemistry and photophysics processes involve structures far from equilibrium. In these reactions, there is often strong coupling between nuclear and electronic degrees of freedom. For first-row transition metals, K beta X-ray emission spectroscopy (XES) is a sensitive probe of electronic structure due to the direct overlap between the valence orbitals and the 3p hole in the final state. Here the sensitivity of K beta mainline (K beta(1,3)) XES to structural dynamics is analyzed by simulating spectral changes along the excited state dynamics of an iron photosensitizer [Fe-II(bmip)(2)](2+) [bmip = 2,6-bis(3-methyl-imidazole-1-ylidine)-pyridine], using both restricted active space (RAS) multiconfigurational wavefunction theory and a one-electron orbital-energy approach in density-functional theory (1-DFT). Both methods predict a spectral blue-shift with increasing metal-ligand distance, which changes the emission intensity for any given detection energy. These results support the suggestion that the [Fe-II(bmip)(2)](2+) femtosecond K beta XES signal shows oscillations due to coherent wavepacket dynamics. Based on the RAS results, the sensitivity to structural dynamics is twice as high for K beta compared to K alpha, with the drawback of a lower signal-to-noise ratio. K beta sensitivity is favored by a larger spectral blue-shift with increasing metal-ligand distance and larger changes in spectral shape. Comparing the two simulations methods, 1-DFT predicts smaller energy shifts and lower sensitivity, likely due to missing final-state effects. The simulations can be used to design and interpret XES probes of non-equilibrium structures to gain mechanistic insights in photocatalysis.

Published
2023
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33. The OpenMolcas Web:A Community-Driven Approach to Advancing Computational Chemistry

Author

Li Manni, Giovanni, Fdez. Galván, Ignacio, Alavi, Ali, Aleotti, Flavia, Aquilante, Francesco, Autschbach, Jochen, Avagliano, Davide, Baiardi, Alberto, Bao, Jie J., Battaglia, Stefano, Birnoschi, Letitia, Blanco-González, Alejandro, Bokarev, Sergey I., Broer, Ria, Cacciari, Roberto, Calio, Paul B., Carlson, Rebecca K., Carvalho Couto, Rafael, Cerdán, Luis, Chibotaru, Liviu F., Chilton, Nicholas F., Church, Jonathan Richard, Conti, Irene, Coriani, Sonia, Cuéllar-Zuquin, Juliana, Daoud, Razan E., Dattani, Nike, Decleva, Piero, de Graaf, Coen, Delcey, Mickaël G., De Vico, Luca, Dobrautz, Werner, Dong, Sijia S., Feng, Rulin, Ferré, Nicolas, Filatov(Gulak), Michael, Gagliardi, Laura, Garavelli, Marco, González, Leticia, Guan, Yafu, Guo, Meiyuan, Hennefarth, Matthew R., Hermes, Matthew R., Hoyer, Chad E., Huix-Rotllant, Miquel, Jaiswal, Vishal Kumar, Kaiser, Andy, Kaliakin, Danil S., Khamesian, Marjan, King, Daniel S., Kochetov, Vladislav, Krośnicki, Marek, Kumaar, Arpit Arun, Larsson, Ernst D., Lehtola, Susi, Lepetit, Marie Bernadette, Lischka, Hans, López Ríos, Pablo, Lundberg, Marcus, Ma, Dongxia, Mai, Sebastian, Marquetand, Philipp, Merritt, Isabella C.D., Montorsi, Francesco, Mörchen, Maximilian, Nenov, Artur, Nguyen, Vu Ha Anh, Nishimoto, Yoshio, Oakley, Meagan S., Olivucci, Massimo, Oppel, Markus, Padula, Daniele, Pandharkar, Riddhish, Phung, Quan Manh, Plasser, Felix, Raggi, Gerardo, Rebolini, Elisa, Reiher, Markus, Rivalta, Ivan, Roca-Sanjuán, Daniel, Romig, Thies, Safari, Arta Anushirwan, Sánchez-Mansilla, Aitor, Sand, Andrew M., Schapiro, Igor, Scott, Thais R., Segarra-Martí, Javier, Segatta, Francesco, Sergentu, Dumitru Claudiu, Sharma, Prachi, Shepard, Ron, Shu, Yinan, Staab, Jakob K., Straatsma, Tjerk P., Sørensen, Lasse Kragh, Tenorio, Bruno Nunes Cabral, Truhlar, Donald G., Ungur, Liviu, Vacher, Morgane, Veryazov, Valera, Voß, Torben Arne, Weser, Oskar, Wu, Dihua, Yang, Xuchun, Yarkony, David, Zhou, Chen, Zobel, J. Patrick, Lindh, Roland, Li Manni, Giovanni, Fdez. Galván, Ignacio, Alavi, Ali, Aleotti, Flavia, Aquilante, Francesco, Autschbach, Jochen, Avagliano, Davide, Baiardi, Alberto, Bao, Jie J., Battaglia, Stefano, Birnoschi, Letitia, Blanco-González, Alejandro, Bokarev, Sergey I., Broer, Ria, Cacciari, Roberto, Calio, Paul B., Carlson, Rebecca K., Carvalho Couto, Rafael, Cerdán, Luis, Chibotaru, Liviu F., Chilton, Nicholas F., Church, Jonathan Richard, Conti, Irene, Coriani, Sonia, Cuéllar-Zuquin, Juliana, Daoud, Razan E., Dattani, Nike, Decleva, Piero, de Graaf, Coen, Delcey, Mickaël G., De Vico, Luca, Dobrautz, Werner, Dong, Sijia S., Feng, Rulin, Ferré, Nicolas, Filatov(Gulak), Michael, Gagliardi, Laura, Garavelli, Marco, González, Leticia, Guan, Yafu, Guo, Meiyuan, Hennefarth, Matthew R., Hermes, Matthew R., Hoyer, Chad E., Huix-Rotllant, Miquel, Jaiswal, Vishal Kumar, Kaiser, Andy, Kaliakin, Danil S., Khamesian, Marjan, King, Daniel S., Kochetov, Vladislav, Krośnicki, Marek, Kumaar, Arpit Arun, Larsson, Ernst D., Lehtola, Susi, Lepetit, Marie Bernadette, Lischka, Hans, López Ríos, Pablo, Lundberg, Marcus, Ma, Dongxia, Mai, Sebastian, Marquetand, Philipp, Merritt, Isabella C.D., Montorsi, Francesco, Mörchen, Maximilian, Nenov, Artur, Nguyen, Vu Ha Anh, Nishimoto, Yoshio, Oakley, Meagan S., Olivucci, Massimo, Oppel, Markus, Padula, Daniele, Pandharkar, Riddhish, Phung, Quan Manh, Plasser, Felix, Raggi, Gerardo, Rebolini, Elisa, Reiher, Markus, Rivalta, Ivan, Roca-Sanjuán, Daniel, Romig, Thies, Safari, Arta Anushirwan, Sánchez-Mansilla, Aitor, Sand, Andrew M., Schapiro, Igor, Scott, Thais R., Segarra-Martí, Javier, Segatta, Francesco, Sergentu, Dumitru Claudiu, Sharma, Prachi, Shepard, Ron, Shu, Yinan, Staab, Jakob K., Straatsma, Tjerk P., Sørensen, Lasse Kragh, Tenorio, Bruno Nunes Cabral, Truhlar, Donald G., Ungur, Liviu, Vacher, Morgane, Veryazov, Valera, Voß, Torben Arne, Weser, Oskar, Wu, Dihua, Yang, Xuchun, Yarkony, David, Zhou, Chen, Zobel, J. Patrick, and Lindh, Roland

Abstract

The developments of the open-source OpenMolcas chemistry software environment since spring 2020 are described, with a focus on novel functionalities accessible in the stable branch of the package or via interfaces with other packages. These developments span a wide range of topics in computational chemistry and are presented in thematic sections: electronic structure theory, electronic spectroscopy simulations, analytic gradients and molecular structure optimizations, ab initio molecular dynamics, and other new features. This report offers an overview of the chemical phenomena and processes OpenMolcas can address, while showing that OpenMolcas is an attractive platform for state-of-the-art atomistic computer simulations.

Published
2023

34. Core-level nonlinear spectroscopy triggered by stochastic X-ray pulses

Author

Kayser, Yves, Milne, Chris, Juranić, Pavle, Sala, Leonardo, Czapla-Masztafiak, Joanna, Follath, Rolf, Kavčič, Matjaž, Knopp, Gregor, Rehanek, Jens, Błachucki, Wojciech, Delcey, Mickaël G., Lundberg, Marcus, Tyrała, Krzysztof, Zhu, Diling, Alonso-Mori, Roberto, Abela, Rafael, Sá, Jacinto, and Szlachetko, Jakub

Published
2019
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39. Exact semi-classical light–matter interaction operator applied to two-photon processes with strong relativistic effects.

Author

Delcey, Mickaël G., Couto, Rafael Carvalho, Sørensen, Lasse Kragh, Fdez. Galván, Ignacio, Guo, Meiyuan, Lindh, Roland, and Lundberg, Marcus

Subjects
INELASTIC scattering, X-ray scattering, MAGNITUDE (Mathematics), PHOTON scattering, ENERGY level transitions, PHOTONS, WAVELENGTHS
Abstract

X-ray processes involve interactions with high-energy photons. For these short wavelengths, the perturbing field cannot be treated as constant, and there is a need to go beyond the electric-dipole approximation. The exact semi-classical light–matter interaction operator offers several advantages compared to the multipole expansion such as improved stability and ease of implementation. Here, the exact operator is used to model x-ray scattering in metal K pre-edges. This is a relativistic two-photon process where absorption is dominated by electric-dipole forbidden transitions. With the restricted active space state-interaction approach, spectra can be calculated even for the multiconfigurational wavefunctions including second-order perturbation. However, as the operator itself depends on the transition energy, the cost for evaluating integrals for hundreds of thousands unique transitions becomes a bottleneck. Here, this is solved by calculating the integrals in a molecular-orbital basis that only runs over the active space, combined with a grouping scheme where the operator is the same for close-lying transitions. This speeds up the calculations of single-photon processes and is critical for the modeling of two-photon scattering processes. The new scheme is used to model Kα resonant inelastic x-ray scattering of iron–porphyrin complexes with relevance to studies of heme enzymes, for which the total computational time is reduced by several orders of magnitude with an effect on transition intensities of 0.1% or less. [ABSTRACT FROM AUTHOR]

Published
2020
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40. Modern quantum chemistry with [Open]Molcas.

Author

Aquilante, Francesco, Autschbach, Jochen, Baiardi, Alberto, Battaglia, Stefano, Borin, Veniamin A., Chibotaru, Liviu F., Conti, Irene, De Vico, Luca, Delcey, Mickaël, Fdez. Galván, Ignacio, Ferré, Nicolas, Freitag, Leon, Garavelli, Marco, Gong, Xuejun, Knecht, Stefan, Larsson, Ernst D., Lindh, Roland, Lundberg, Marcus, Malmqvist, Per Åke, and Nenov, Artur

Subjects
DENSITY matrices, DENSITY functional theory, RENORMALIZATION group, HARTREE-Fock approximation, WAVE functions, QUANTUM chemistry
Abstract

MOLCAS/OpenMolcas is an ab initio electronic structure program providing a large set of computational methods from Hartree–Fock and density functional theory to various implementations of multiconfigurational theory. This article provides a comprehensive overview of the main features of the code, specifically reviewing the use of the code in previously reported chemical applications as well as more recent applications including the calculation of magnetic properties from optimized density matrix renormalization group wave functions. [ABSTRACT FROM AUTHOR]

Published
2020
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41. Setting the stage for theoretical x-ray spectra of the H2S molecule with multi-configurational quantum chemical calculations of the energy landscape.

Author

Ertan, Emelie, Lundberg, Marcus, Sørensen, Lasse Kragh, and Odelius, Michael

Subjects
*CHEMICAL energy, *MOLECULAR spectra, *POTENTIAL energy surfaces, *MOLECULAR orbitals, *X-ray spectroscopy, *X-ray spectra
Abstract

In the H2S molecule, the interplay between different core levels can be investigated in great detail in relation to x-ray spectroscopy, which requires a theory for interpretation. Hence, valence and core excitations into the two antibonding molecular orbitals of the H2S molecule have been calculated within a multi-configurational wave function framework. Scanning along the S–H stretching coordinates, we derive potential energy surfaces and transition dipole moments involving the ground state and core and valence excited states. Both valence excitations and the S1s−1 and S2p−1 core excitations show pairs of dissociative and bound electronic states. These pairs of states are nearly degenerate in H2S at the ground state geometry. The close degeneracy together with conical intersections makes H2S an interesting target for x-ray spectroscopy involving ultra-fast dissociation influenced by non-adiabatic transitions and interference. For future investigations with x-ray absorption spectroscopy (XAS) and resonant inelastic x-ray scattering (RIXS), it is valuable to compare H2S with the water molecule, which exhibits state-selective gating to different vibrational modes [R. C. Couto et al., Nat. Commun. 8, 14165 (2017)] in its well-separated O1s−1 core excited states. The dense manifolds of the S2p−1 core excited states will complicate the analysis of Kα edge RIXS, but dynamical effects could be evaluated through detuning and by comparing with L edge XAS. In L edge RIXS, the dynamical effects will be more pronounced due to the longer lifetime of the S2p−1 core excited states compared to the S1s−1 core excited states. [ABSTRACT FROM AUTHOR]

Published
2020
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44. Water Oxidation by Pentapyridyl Base Metal Complexes? A Case Study

Author

Boniolo, Manuel, primary, Hossain, Md Kamal, additional, Chernev, Petko, additional, Suremann, Nina F., additional, Heizmann, Philipp A., additional, Lyvik, Amanda S.L., additional, Beyer, Paul, additional, Haumann, Michael, additional, Huang, Ping, additional, Salhi, Nessima, additional, Cheah, Mun Hon, additional, Shylin, Sergii I., additional, Lundberg, Marcus, additional, Thapper, Anders, additional, and Messinger, Johannes, additional

Published
2022
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48. Soft X-ray signatures of cationic manganese-oxo systems, including a high-spin manganese(v) complex

Author

Delcey, Mickaël G., Lindblad, Rebecka, Timm, Martin, Bülow, Christine, Zamudio-Bayer, Vicente, von Issendorff, Bernd, Lau, J. Tobias, Lundberg, Marcus, Delcey, Mickaël G., Lindblad, Rebecka, Timm, Martin, Bülow, Christine, Zamudio-Bayer, Vicente, von Issendorff, Bernd, Lau, J. Tobias, and Lundberg, Marcus

Abstract

Manganese–oxo species catalyze key reactions, including C–H bond activation or dioxygen formation in natural photosynthesis. To better understand relevant reaction intermediates, we characterize electronic states and geometric structures of [MnOn]+ manganese–oxo complexes that represent a wide range of manganese oxidation states. To this end, we apply soft X-ray spectroscopy in a cryogenic ion trap, combined with multiconfigurational wavefunction calculations. We identify [MnO2]+ as a rare high-spin manganese(V) oxo complex with key similarities to six-coordinated manganese(V) oxo systems that are proposed as reaction intermediates in catalytic dioxygen bond formation.

Published
2022
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49. Water Oxidation by Pentapyridyl Base Metal Complexes? : A Case Study

Author

Boniolo, Manuel, Hossain, Md Kamal, Chernev, Petko, Suremann, Nina F., Heizmann, Philipp A., Lyvik, Amanda S.L., Beyer, Paul, Haumann, Michael, Huang, Ping, Salhi-Benachenhou, Nessima, Cheah, Mun Hon, Shylin, Sergii I., Lundberg, Marcus, Thapper, Anders, Messinger, Johannes, Boniolo, Manuel, Hossain, Md Kamal, Chernev, Petko, Suremann, Nina F., Heizmann, Philipp A., Lyvik, Amanda S.L., Beyer, Paul, Haumann, Michael, Huang, Ping, Salhi-Benachenhou, Nessima, Cheah, Mun Hon, Shylin, Sergii I., Lundberg, Marcus, Thapper, Anders, and Messinger, Johannes

Abstract

The design of molecular water oxidation catalysts (WOCs) requires a rational approach that considers the intermediate steps of the catalytic cycle, including water binding, deprotonation, storage of oxidizing equivalents, O–O bond formation, and O2 release. We investigated several of these properties for a series of base metal complexes (M = Mn, Fe, Co, Ni) bearing two variants of a pentapyridyl ligand framework, of which some were reported previously to be active WOCs. We found that only [Fe(Py5OMe)Cl]+ (Py5OMe = pyridine-2,6-diylbis[di-(pyridin-2-yl)methoxymethane]) showed an appreciable catalytic activity with a turnover number (TON) = 130 in light-driven experiments using the [Ru(bpy)3]2+/S2O82– system at pH 8.0, but that activity is demonstrated to arise from the rapid degradation in the buffered solution leading to the formation of catalytically active amorphous iron oxide/hydroxide (FeOOH), which subsequently lost the catalytic activity by forming more extensive and structured FeOOH species. The detailed analysis of the redox and water-binding properties employing electrochemistry, X-ray absorption spectroscopy (XAS), UV–vis spectroscopy, and density-functional theory (DFT) showed that all complexes were able to undergo the MIII/MII oxidation, but none was able to yield a detectable amount of a MIV state in our potential window (up to +2 V vs SHE). This inability was traced to (i) the preference for binding Cl– or acetonitrile instead of water-derived species in the apical position, which excludes redox leveling via proton coupled electron transfer, and (ii) the lack of sigma donor ligands that would stabilize oxidation states beyond MIII. On that basis, design features for next-generation molecular WOCs are suggested.

Published
2022
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50. Approaching the Attosecond Frontier of Dynamics in Matter with the Concept of X-ray Chronoscopy

Author

Blachucki, Wojciech, Wach, Anna, Czapla-Masztafiak, Joanna, Delcey, Mickael, Arrell, Christopher, Fanselow, Rafal, Juranic, Pavle, Lundberg, Marcus, Milne, Christopher, Sá, Jacinto, Szlachetko, Jakub, Blachucki, Wojciech, Wach, Anna, Czapla-Masztafiak, Joanna, Delcey, Mickael, Arrell, Christopher, Fanselow, Rafal, Juranic, Pavle, Lundberg, Marcus, Milne, Christopher, Sá, Jacinto, and Szlachetko, Jakub

Abstract

Featured Application Herein, an innovative methodology, called X-ray chronoscopy, is proposed for exploration of ultrafast processes in matter with attosecond precision using current XFEL sources. The method is based on measuring the change in an X-ray pulse temporal profile induced by interaction with a medium. X-ray free electron lasers (XFELs) have provided scientists opportunities to study matter with unprecedented temporal and spatial resolutions. However, access to the attosecond domain (i.e., below 1 femtosecond) remains elusive. Herein, a time-dependent experimental concept is theorized, allowing us to track ultrafast processes in matter with sub-fs resolution. The proposed X-ray chronoscopy approach exploits the state-of-the-art developments in terahertz streaking to measure the time structure of X-ray pulses with ultrahigh temporal resolution. The sub-femtosecond dynamics of the saturable X-ray absorption process is simulated. The employed rate equation model confirms that the X-ray-induced mechanisms leading to X-ray transparency can be probed via measurement of an X-ray pulse time structure.

Published
2022
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