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725 results on '"Schmidt-Böcking, H"'

2. Two-Particle Interference of Electron Pairs on a Molecular Level

Author

Waitz, M, Metz, D, Lower, J, Schober, C, Keiling, M, Pitzer, M, Mertens, K, Martins, M, Viefhaus, J, Klumpp, S, Weber, T, Schmidt-Böcking, H, Schmidt, L Ph H, Morales, F, Miyabe, S, Rescigno, TN, McCurdy, CW, Martín, F, Williams, JB, Schöffler, MS, Jahnke, T, and Dörner, R

Subjects
Atomic, Molecular and Optical Physics, Physical Sciences, physics.atom-ph, physics.atm-clus, quant-ph, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

We investigate the photodouble ionization of H_{2} molecules with 400 eV photons. We find that the emitted electrons do not show any sign of two-center interference fringes in their angular emission distributions if considered separately. In contrast, the quasiparticle consisting of both electrons (i.e., the "dielectron") does. The work highlights the fact that nonlocal effects are embedded everywhere in nature where many-particle processes are involved.

Published
2016

5. High-Resolution Momentum Imaging—From Stern’s Molecular Beam Method to the COLTRIMS Reaction Microscope

Author

Jahnke, T., primary, Mergel, V., additional, Jagutzki, O., additional, Czasch, A., additional, Ullmann, K., additional, Ali, R., additional, Frohne, V., additional, Weber, T., additional, Schmidt, L. P., additional, Eckart, S., additional, Schöffler, M., additional, Schößler, S., additional, Voss, S., additional, Landers, A., additional, Fischer, D., additional, Schulz, M., additional, Dorn, A., additional, Spielberger, L., additional, Moshammer, R., additional, Olson, R., additional, Prior, M., additional, Dörner, R., additional, Ullrich, J., additional, Cocke, C. L., additional, and Schmidt-Böcking, H., additional

Published
2021
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7. Ejection of Quasi-Free-Electron Pairs from the Helium-Atom Ground State by Single-Photon Absorption

Author

Schöffler, MS, Stuck, C, Waitz, M, Trinter, F, Jahnke, T, Lenz, U, Jones, M, Belkacem, A, Landers, AL, Pindzola, MS, Cocke, CL, Colgan, J, Kheifets, A, Bray, I, Schmidt-Böcking, H, Dörner, R, and Weber, Th

Subjects
Atomic, Molecular and Optical Physics, Physical Sciences, physics.atom-ph, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

We investigate the single-photon double ionization of helium at photon energies of 440 and 800 eV. We observe doubly charged ions with close to zero momentum corresponding to electrons emitted back to back with equal energy. These slow ions are the unique fingerprint of an elusive quasifree photon double ionization mechanism predicted by Amusia et al. nearly four decades ago [J. Phys. B 8, 1248 (1975)]. It results from the nondipole part of the electromagnetic interaction. Our experimental data are supported by calculations performed using the convergent close-coupling and time-dependent close-coupling methods.

Published
2013

8. High-Resolution Momentum Imaging—From Stern’s Molecular Beam Method to the COLTRIMS Reaction Microscope

Author

Jahnke, T, Mergel, V, Jagutzki, O, Czasch, A, Ullmann, K, Ali, R, Frohne, V, Weber, T, Schmidt, LP, Eckart, S, Schöffler, M, Schößler, S, Voss, S, Landers, A, Fischer, D, Schulz, M, Dorn, A, Spielberger, L, Moshammer, R, Olson, R, Prior, M, Dörner, R, Ullrich, J, Cocke, CL, and Schmidt-Böcking, H

Subjects
Nuclear and Plasma Physics, Quantum Physics, Synchrotrons and Accelerators, Physical Sciences, Atomic, Molecular and Optical Physics
Abstract

Multi-particle momentum imaging experiments are now capable of providing detailed information on the properties and the dynamics of quantum systems in Atomic, Molecular and Photon (AMO) physics. Historically, Otto Stern can be considered the pioneer of high-resolution momentum measurements of particles moving in a vacuum and he was the first to obtain sub-atomic unit (a.u.) momentum resolution (Schmidt-Böcking et al. in The precision limits in a single-event quantum measurement of electron momentum and position, these proceedings [1]). A major contribution to modern experimental atomic and molecular physics was his so-called molecular beam method [2], which Stern developed and employed in his experiments. With this method he discovered several fundamental properties of atoms, molecules and nuclei [2, 3]. As corresponding particle detection techniques were lacking during his time, he was only able to observe the averaged footprints of large particle ensembles. Today it is routinely possible to measure the momenta of single particles, because of the tremendous progress in single particle detection and data acquisition electronics. A "state-of-the-art" COLTRIMS reaction microscope [4-11] can measure, for example, the momenta of several particles ejected in the same quantum process in coincidence with sub-a.u. momentum resolution. Such setups can be used to visualize the dynamics of quantum reactions and image the entangled motion of electrons inside atoms and molecules. This review will briefly summarize Stern's work and then present in longer detail the historic steps of the development of the COLTRIMS reaction microscope. Furthermore, some benchmark results are shown which initially paved the way for a broad acceptance of the COLTRIMS approach. Finally, a small selection of milestone work is presented which has been performed during the last two decades.

Published
2021

9. Auger decay of 1σg and 1σu hole states of the N2 molecule: Disentangling decay routes from coincidence measurements

Author

Semenov, SK, Schöffler, MS, Titze, J, Petridis, N, Jahnke, T, Cole, K, Schmidt, LPH, Czasch, A, Akoury, D, Jagutzki, O, Williams, JB, Osipov, T, Lee, S, Prior, MH, Belkacem, A, Landers, AL, Schmidt-Böcking, H, Weber, T, Cherepkov, NA, and Dörner, R

Subjects
physics.atom-ph, General Physics, Physical Sciences, Mathematical Sciences, Chemical Sciences
Abstract

Results of the most sophisticated measurements in coincidence with the angular-resolved K-shell photoelectrons and Auger electrons and with two atomic ions produced by dissociation of N2 molecule are analyzed. Detection of photoelectrons at certain angles makes it possible to separate the Auger decay processes of the 1σg and 1σu core-hole states. The Auger electron angular distributions for each of these hole states are measured as a function of the kinetic-energy release of two atomic ions and are compared with the corresponding theoretical angular distributions. From that comparison one can disentangle the contributions of different repulsive doubly charged molecular ion states to the Auger decay. Different kinetic-energy-release values are directly related to the different internuclear distances. In this way one can trace experimentally the behavior of the potential energy curves of dicationic final states inside the Frank-Condon region. Presentation of the Auger-electron angular distributions as a function of kinetic-energy release of two atomic ions opens a new dimension in the study of Auger decay. © 2010 The American Physical Society.

Published
2010

10. One hundred years ago Alfred Land\'e unriddled the Anomalous Zeeman Effect and presaged Electron Spin

Author

Schmidt-Böcking, H., Gruber, G., and Friedrich, B.

Subjects
Condensed Matter::Quantum Gases, Physics - History and Philosophy of Physics, History and Philosophy of Physics (physics.hist-ph), FOS: Physical sciences, Physics::Atomic Physics, Condensed Matter Physics, Mathematical Physics, Atomic and Molecular Physics, and Optics, Physics::History of Physics
Abstract

In order to commemorate Alfred Landé’s unriddling of the anomalous Zeeman Effect a century ago, we reconstruct his seminal contribution to atomic physics in light of the atomic models available at the time. Landé recognized that the coupling of quantized electronic angular momenta via their vector addition within an atom was the origin of all the apparent mysteries of atomic structure as manifested by the anomalous Zeeman effect. We show to which extent Landé’s ideas influenced the development of quantum physics, particularly Wolfgang Pauli’s path to the exclusion principle. We conclude with Landé’s brief biography.

Published
2022

11. Fourfold Differential Photoelectron Circular Dichroism

Author

Fehre, K., primary, Novikovskiy, N. M., additional, Grundmann, S., additional, Kastirke, G., additional, Eckart, S., additional, Trinter, F., additional, Rist, J., additional, Hartung, A., additional, Trabert, D., additional, Janke, C., additional, Nalin, G., additional, Pitzer, M., additional, Zeller, S., additional, Wiegandt, F., additional, Weller, M., additional, Kircher, M., additional, Hofmann, M., additional, Schmidt, L. Ph. H., additional, Knie, A., additional, Hans, A., additional, Ltaief, L. Ben, additional, Ehresmann, A., additional, Berger, R., additional, Fukuzawa, H., additional, Ueda, K., additional, Schmidt-Böcking, H., additional, Williams, J. B., additional, Jahnke, T., additional, Dörner, R., additional, Schöffler, M. S., additional, and Demekhin, Ph. V., additional

Published
2021
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13. Single photon double ionization of $\mbox{\sffamily\bfseries H}_{\hbox{\sffamily\bfseries\fontsize{10}{12}\selectfont 2}}$ by circularly polarized photons at a photon energy of 160 eV: Interference, decoherence and its dependence on the internuclear distance

Author

Kreidi, K., Akoury, D., Jahnke, T., Weber, Th., Staudte, A., Schöffler, M., Neumann, N., Titze, J., Schmidt, L. Ph.H., Czasch, A., Jagutzki, O., Costa Fraga, R. A., Grisenti, R. E., Díez Muiño, R., Cherepkov, N. A., Semenov, S. K., Ranitovic, P., Cocke, C. L., Osipov, T., Adaniya, H., Thompson, J. C., Prior, M. H., Belkacem, A., Landers, A., Schmidt-Böcking, H., and Dörner, R.

Published
2009
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16. Quantum interference of K capture in energetic Ge31+(1s)-Kr collisions

Author

Schuch, Reinhold, Schulz, M., Kozhedub, Y. S., Shabaev, V. M., Tupitsyn, I. I., Plunien, G., Mokler, P. H., Schmidt-Böcking, H., Schuch, Reinhold, Schulz, M., Kozhedub, Y. S., Shabaev, V. M., Tupitsyn, I. I., Plunien, G., Mokler, P. H., and Schmidt-Böcking, H.

Abstract

We have measured characteristic K x rays in coincidence with the scattered particles from collisions of hydrogenlike Ge ions with Kr atoms. The ions were first accelerated to 8.6 MeV/amu, post-stripped to H-like charge state, and decelerated to around 2.5 MeV/amu. From the measurements the probabilities for K-shell to K-shell charge transfer as a function of collision impact parameters were obtained. The probabilities show an onset of oscillations which are interpreted as quantum interference between the K-shell to K-shell electron transfer amplitudes in two spatially separated coupling regions in the incoming and outgoing parts of the collision. The probabilities of K-shell vacancy distribution created by the collision are calculated within a relativistic independent electron model using the coupled-channel approach with atomlike Dirac-Fock-Sturm orbitals. A reasonable agreement between the theoretical results and the experimental data is found.

Published
2020
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19. Experimental and theoretical study of singly ionizing 1-MeV p+He collisions at different energy and momentum transfer values

Author

Chuluunbaatar, O, primary, Kouzakov, K A, additional, Zaytsev, S A, additional, Zaytsev, A S, additional, Shablov, V L, additional, Popov, Yu V, additional, Gassert, H, additional, Waitz, M, additional, Kim, H-K, additional, Bauer, T, additional, Laucke, A, additional, Müller, Ch, additional, Voigtsberger, J, additional, Weller, M, additional, Rist, J, additional, Pahl, K, additional, Honig, M, additional, Pitzer, M, additional, Zeller, S, additional, Jahnke, T, additional, Ph, L, additional, Schmidt, H, additional, Schmidt-Böcking, H, additional, Dörner, R, additional, and Schöffler, M S, additional

Published
2020
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22. Ultrafast Probing of Core Hole Localization in N2

Author

Schöffler, M. S., Titze, J., Petridis, N., Jahnke, T., Cole, K., Schmidt, L. Ph. H., Czasch, A., Akoury, D., Jagutzki, O., Williams, J. B., Cherepkov, N. A., Semenov, S. K., McCurdy, C. W., Rescigno, T. N., Cocke, C. L., Osipov, T., Lee, S., Prior, M. H., Belkacem, A, Landers, A. L., Schmidt-Böcking, H., Weber, Th., and Dörner, R.

Published
2008
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24. From Atoms to Molecules

Author

Dörner, R., primary, Schmidt-Böcking, H., additional, Mergel, V., additional, Weber, T., additional, Spielberger, L., additional, Jagutzki, O., additional, Knapp, A., additional, and Bräuning, H. P., additional

Published
2003
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25. The Simplest Double Slit: Interference and Entanglement in Double Photoionization of H2

Author

Akoury, D., Kreidi, K., Jahnke, T., Weber, Th., Staudte, A., Schöffler, M., Neumann, N., Titze, J., Schmidt, L. Ph. H., Czasch, A., Jagutzki, O., Costa Fraga, R. A., Grisenti, R. E., Muiño, R. Díez, Cherepkov, N. A., Semenov, S. K., Ranitovic, P., Cocke, C. L., Osipov, T., Adaniya, H., Thompson, J. C., Prior, M. H., Belkacem, A., Landers, A. L., Schmidt-Böcking, H., and Dörner, R.

Published
2007
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26. Single Photon-Induced Symmetry Breaking of H2 Dissociation

Author

Martín, F., Fernández, J., Havermeier, T., Foucar, L., Weber, Th., Kreidi, K., Schöffler, M., Schmidt, L., Jahnke, T., Jagutzki, O., Czasch, A., Benis, E. P., Osipov, T., Landers, A. L., Belkacem, A., Prior, M. H., Schmidt-Böcking, H., Cocke, C. L., and Dörner, R.

Published
2007

27. Multiple Ionization in Strong Laser Fields

Author

Dörner, R., primary, Weber, Th., additional, Weckenbrock, M., additional, Staudte, A., additional, Hattass, M., additional, Schmidt-Böcking, H., additional, Moshammer, R., additional, and Ullrich, J., additional

Published
2002
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28. 3-D Coincident Imaging Spectroscopy for Ions and Electrons

Author

Dörner, R., primary, Weber, T., additional, Achler, M., additional, Mergel, V., additional, Spielberger, L., additional, Jagutzki, O., additional, Afaneh, F., additional, Prior, M. H., additional, Cocke, C. L., additional, and Schmidt-Böcking, H., additional

Published
2000
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30. Complete photo-fragmentation of the deuterium molecule

Author

Weber, T., Czasch, A. O., Jagutzki, O., Müller, A. K., Mergel, V., Kheifets, A., Rotenberg, E., Meigs, G., Prior, M. H., Daveau, S., Landers, A., Cocke, C. L., Osipov, T., Díez Muiño, R., Schmidt-Böcking, H., and Dörner, R.

Published
2004

33. Recoil Ion Momentum Spectroscopy Momentum Space Images of Atomic Reactions

Author

Dörner, R., primary, Weber, T., additional, Khayyat, Kh., additional, Mergel, V., additional, Bräuning, H., additional, Achler, M., additional, Jagutzki, O., additional, Spielberger, L., additional, Ullrich, J., additional, Moshammer, R., additional, Schmitt, W., additional, Olson, R. E., additional, Wood, C., additional, and Schmidt-Böcking, H., additional

Published
1999
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38. From (γ,2e) to (γ,eR): Kinematically Complete Experiments with Coltrims

Author

Vogt, T., primary, Dörner, R., additional, Jagutzki, O., additional, Cocke, C. L., additional, Feagin, J., additional, Jung, M., additional, Kanter, E. P., additional, Khemliche, H., additional, Kravis, S., additional, Mergel, V., additional, Spielberger, L., additional, Ullrich, J., additional, Unverzagt, M., additional, Bräuning, H., additional, Meyer, U., additional, and Schmidt-Böcking, H., additional

Published
1997
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39. Single ionization of helium by fast proton impact in different kinematical regimes

Author

Chuluunbaatar, O., primary, Kouzakov, K. A., additional, Zaytsev, S. A., additional, Zaytsev, A. S., additional, Shablov, V. L., additional, Popov, Yu. V., additional, Gassert, H., additional, Waitz, M., additional, Kim, H.-K., additional, Bauer, T., additional, Laucke, A., additional, Müller, Ch., additional, Voigtsberger, J., additional, Weller, M., additional, Rist, J., additional, Pahl, K., additional, Honig, M., additional, Pitzer, M., additional, Zeller, S., additional, Jahnke, T., additional, Schmidt, L. Ph. H., additional, Schmidt-Böcking, H., additional, Dörner, R., additional, and Schöffler, M. S., additional

Published
2019
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42. Dynamics of recoil-ion production

Author

Dörner, R., primary, Ullrich, J., additional, Jagutzki, O., additional, Lencinas, S., additional, Schmidt-Böcking, H., additional, and Olson, R. E., additional

Published
1991
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47. Direct determination of molecular handedness via coulomb explosion imaging

Author

Pitzer, M, Kunitski, M, Kastirke, G, Jahnke, T, Bauer, T, Goihl, C, Trinter, F, Schober, C, Henrichs, K, Becht, J, Zeller, S, Gassert, H, Waitz, M, Kuhlins, A, Wiegandt, F, Wallauer, R, Schmidt, L Ph H, Mazenauer, Manuel, Spenger, Benjamin, Marquardt, S, Schmidt-Böcking, H, Stohner, Jürgen, Dörner, R, Schöffler, M S, Berger, R, Pitzer, M, Kunitski, M, Kastirke, G, Jahnke, T, Bauer, T, Goihl, C, Trinter, F, Schober, C, Henrichs, K, Becht, J, Zeller, S, Gassert, H, Waitz, M, Kuhlins, A, Wiegandt, F, Wallauer, R, Schmidt, L Ph H, Mazenauer, Manuel, Spenger, Benjamin, Marquardt, S, Schmidt-Böcking, H, Stohner, Jürgen, Dörner, R, Schöffler, M S, and Berger, R

Published
2018

48. Direct determination of molecular handedness via coulomb explosion imaging

Author

Pitzer, M., Kunitski, M., Kastirke, G., Jahnke, T., Bauer, T., Goihl, C., Trinter, F., Schober, C., Henrichs, K., Becht, J., Zeller, S., Gassert, H., Waitz, M., Kuhlins, A., Wiegandt, F., Wallauer, R., Schmidt, L.Ph.H., Mazenauer, M., Spenger, B., Marquardt, S., Schmidt-Böcking, H., Stohner, J., Dörner, R., Schöffler, M.S., Berger, R., Pitzer, M., Kunitski, M., Kastirke, G., Jahnke, T., Bauer, T., Goihl, C., Trinter, F., Schober, C., Henrichs, K., Becht, J., Zeller, S., Gassert, H., Waitz, M., Kuhlins, A., Wiegandt, F., Wallauer, R., Schmidt, L.Ph.H., Mazenauer, M., Spenger, B., Marquardt, S., Schmidt-Böcking, H., Stohner, J., Dörner, R., Schöffler, M.S., and Berger, R.

Abstract

In this work, we show that the direct determination of a chiral molecule's absolute configuration can be achieved with Coulomb Explosion Imaging in a COLTRIMS reaction microscope. We compare the results after ionisation with femto-second laser pulses and with X-ray synchrotron light. Different fragmentation pathways of the prototypical chiral molecule CHBrClF are identified that carry information on the handedness. The applicabilty of the technique towards bigger molecules is discussed.

Published
2018

49. Two-Particle Interference of Electron Pairs on a Molecular Level

Author

Waitz M., Metz D., Lower J., Schober C., Keiling M., Pitzer M., Mertens K., Martins M., Viefhaus J., Klumpp S., Weber T., Schmidt-Böcking H., Schmidt L.P.H., Morales F., Miyabe S., Rescigno T.N., McCurdy C.W., Martín F., Williams J.B., Schöffler M.S., Jahnke T., Dörner R. and This work was funded by the Deutsche Forschungs Gemeinschaft (DFG), the BMBF, the European COST Action Grant No.AXLIC CM1204, the European Research Council Advanced XCHEM Grant No.A290853, and the MINECO Project Grant No.AFIS2013-42002-R. J.L. thanks the DFG for support. We are grateful to the staff of PETRA III for excellent support during the beam time. Raw data are archived at the Goethe-University Frankfurt am Main and are available on request.

Published
2016

50. Interatomic Coulombic Decay of HeNe dimers after ionization and excitation of He and Ne

Author

Sann, H., primary, Havermeier, T., additional, Kim, H.-K., additional, Sturm, F., additional, Trinter, F., additional, Waitz, M., additional, Zeller, S., additional, Ulrich, B., additional, Meckel, M., additional, Voss, S., additional, Bauer, T., additional, Schneider, D., additional, Schmidt-Böcking, H., additional, Wallauer, R., additional, Schöffler, M., additional, Williams, J.B., additional, Dörner, R., additional, and Jahnke, T., additional

Published
2017
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