Search

Your search keyword '"Mergel V"' showing total 237 results
Start Over Author "Mergel V"
237 results on '"Mergel V"'

1. 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, L. P., 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, C. L., Schmidt-Böcking, H., Friedrich, Bretislav, editor, and Schmidt-Böcking, Horst, editor

Published
2021
Full Text
View/download PDF

2. 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

3. Fully differential cross sections for photo-double-ionization of D{sub 2}

Author

Weber, Th., Czasch, A., Jagutzki, O., Mueller, A., Mergel, V., Kheifets, A., Feagin, J., Rotenberg, E., Meigs, G., Prior, M.H., Daveau, S., Landers, A.L., Cocke, C.L., Osipov, T., Schmidt-Boecking, H., and Doerner, R.

Abstract

We report the first kinematically complete study of the four-body fragmentation of the D2 molecule following absorption of a single photon. For equal energy sharing of the two electrons and a photonenergy of 75.5 eV, we observed the relaxation of one of the selection rules valid for He photo-double ionization and a strong dependence of the electron angular distribution on the orientation of the molecular axis. This effect is reproduced by a model in which a pair of photoionization amplitudes is introduced for the light polarization parallel and perpendicular to the molecular axis.

Published
2003

5. From Atoms to Molecules

Author

Dörner, R., Schmidt-Böcking, H., Mergel, V., Weber, T., Spielberger, L., Jagutzki, O., Knapp, A., Bräuning, H. P., Drake, G. F., editor, Ecker, G., editor, Ullrich, Joachim, editor, and Shevelko, Viatcheslav, editor

Published
2003
Full Text
View/download PDF

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

Author

Dörner, R., Weber, T., Khayyat, Kh., Mergel, V., Bräuning, H., Achler, M., Jagutzki, O., Spielberger, L., Ullrich, J., Moshammer, R., Schmitt, W., Olson, R. E., Wood, C., Schmidt-Böcking, H., Burke, P. G., editor, Kleinpoppen, H., editor, Whelan, Colm T., editor, Dreizler, R. M., editor, Macek, J. H., editor, and Walters, H. R. J., editor

Published
1999
Full Text
View/download PDF

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

Author

Vogt, T., Dörner, R., Jagutzki, O., Cocke, C. L., Feagin, J., Jung, M., Kanter, E. P., Khemliche, H., Kravis, S., Mergel, V., Spielberger, L., Ullrich, J., Unverzagt, M., Bräuning, H., Meyer, U., Schmidt-Böcking, H., Burke, P. G., editor, Kleinpoppen, H., editor, Whelan, Colm T., editor, and Walters, H. R. J., editor

Published
1997
Full Text
View/download PDF

10. Complete photo-fragmentation of the deuterium molecule

Author

Weber, T., Czasch, A. O., Jagutzki, O., Muller, A. K., Mergel, V., Kheifets, A., Rotenberg, E., Meigs, G., Prior, M. H., Daveau, S., Landers, A., Cocke, C. L., Osipov, T., Diez Muino, R., Schmidt-Bocking, H., and Dorner, R.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): T. Weber [1, 2, 3]; A. O. Czasch [1]; O. Jagutzki [1]; A. K. Müller [1]; V. Mergel [1]; A. Kheifets [4]; E. Rotenberg [2]; G. Meigs [2]; M. [...]

Published
2004
Full Text
View/download PDF

11. Correlated electron emission in multiphoton double ionization

Author

Weber, Th., Giessen, H., Weckenbrock, M., Urbasch, G., Staudte, A., Spielberger, L., Jagutzki, O., Mergel, V., Vollmer, M., and Dorner, R.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Th. Weber [1]; H. Giessen [2]; M. Weckenbrock [1]; G. Urbasch [2]; A. Staudte [1]; L. Spielberger [1]; O. Jagutzki [1]; V. Mergel [1]; M. Vollmer [2]; R. Dörner [...]

Published
2000
Full Text
View/download PDF

18. 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
Full Text
View/download PDF

19. 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
Full Text
View/download PDF

29. Double and single ionization of He and other targets studied using cold target recoil momentum spectroscopy

Author

Doerner, R., primary, Feagin, J. M., additional, Brauning, H., additional, Jagutzki, O., additional, Jung, M., additional, Kanter, E. P., additional, Khemliche, H., additional, Kravis, S., additional, Mergel, V., additional, Prior, M. H., additional, Schmidt-Boeking, H., additional, Spielberger, L., additional, Ullrich, J., additional, Unverzagt, M., additional, and Vogt, T., additional

Published
1997
Full Text
View/download PDF

35. Differential cross sections in antiproton- and proton - helium collisions

Author

Khayyat, Kh., Weber, T., Dörner, R., Achler, M., Mergel, V., Spielberger, L., Jagutzki, O., Meyer, U., Ullrich, J., Moshammar, R., Schmitt, W., Knudsen, H., Mikkelsen, U., Aggerholm, P., Uggerhøj, E., Møller, S.P., Rodriguez, V.D., O'Rourke, S.F.C., Olson, R.E., Fainstein, P.D., McGuire, J.H., and Schmidt-Böcking, H.J.

Published
1999

36. Recoil-ion momentum spectroscopy

Author

Ullrich, J, Schmitt, W, Dörner, R, Jagutzki, O, Mergel, V, Moshammer, R, Schmidt-Böcking, H, Spielberger, L, Unverzagt, M, and Olson, R E

Subjects
Other Fields of Physics
Published
1998

37. Photo double ionization of fixed in space deuterium molecules

Author

Weber, Thorsten, Dorner, R, Czasch, A O, Jagutzki, Ottmar, Schmidt-Böcking, H, Muller, A K, Mergel, V, Prior, M H, Osipov, T, Daveau, Sebastian, Rotenberg, E, Meigs, George, Cocke, C L, Landers, A L, Kheifets, Anatoli, Feagin, Jim, Diez-Muino, Ricardo, Weber, Thorsten, Dorner, R, Czasch, A O, Jagutzki, Ottmar, Schmidt-Böcking, H, Muller, A K, Mergel, V, Prior, M H, Osipov, T, Daveau, Sebastian, Rotenberg, E, Meigs, George, Cocke, C L, Landers, A L, Kheifets, Anatoli, Feagin, Jim, and Diez-Muino, Ricardo

Published
2006

38. Double and single ionization of helium by 58-keV X-rays

Author

Spielberger, L, Jagutzki, O, Krässig, B, Meyer, U, Khayyat, K, Mergel, V, Tschentscher, T, Buslaps, T, Bräuning, H, Dörner, R, Vogt, T, Achler, M, Ullrich, J, Gemmell, D S, and Schmidt-Böcking, H

Subjects
Other Fields of Physics
Published
1996

40. Revealing the Effect of Angular Correlation in the Ground-state He Wavefunction: A Coincidence Study of the Transfer Ionization Process

Author

Schoffler, M S, Godunov, A L, Whelan, C T, Walters, H R J, Schipakov, V S, Mergel, V, Dorner, R, Jagutski, O., Schmidt, L Ph H, Titze, J, Weigold, Erich, Schmidt-Böcking, H, Schoffler, M S, Godunov, A L, Whelan, C T, Walters, H R J, Schipakov, V S, Mergel, V, Dorner, R, Jagutski, O., Schmidt, L Ph H, Titze, J, Weigold, Erich, and Schmidt-Böcking, H

Abstract

A joint theoretical-experimental study of the transfer ionization process p + He → H0 + He2+ + e- is presented. For the first time all particles in the final state have been detected in triple coincidence. This fully differential measurement is in good

Published
2005

41. Many-particle Fragmentation Processes in Atomic and Molecular Physics - New Insight into the World of Correlation

Author

Schmidt-Böcking, H, Schoffler, M S, Jahnke, T., Czasch, A O, Mergel, V, Schmidt, L Ph H, Dorner, R, Jagutski, O., Hattass, M., Weber, Thorsten, Weigold, Erich, Schmidt, H T, Schuch, R, Cederquist, H., Demkov, Y., Whelan, C T, Godunov, A L, Walters, J, Schmidt-Böcking, H, Schoffler, M S, Jahnke, T., Czasch, A O, Mergel, V, Schmidt, L Ph H, Dorner, R, Jagutski, O., Hattass, M., Weber, Thorsten, Weigold, Erich, Schmidt, H T, Schuch, R, Cederquist, H., Demkov, Y., Whelan, C T, Godunov, A L, and Walters, J

Abstract

Correlated many-particle dynamics in Coulombic systems, which is one of the unsolved fundamental problems in AMO-physics, can now be experimentally approached with so far unprecedented completeness and precision. The recent development of the COLTRIMS technique (COLd Target Recoil Ion Momentum Spectroscopy) provides a coincident multi-fragment imaging technique for eV and sub-eV fragment detection. In its completeness it is as powerful as the bubble chamber in high energy physics. In recent benchmark experiments quasi snapshots (duration as short as an attosecond) of the correlated dynamics between electrons and nuclei have been made for atomic and molecular objects. This new imaging technique has opened a powerful observation window into the hidden world of many-particle dynamics.

Published
2005

42. Fully differential cross sections for photo-double-ionization of D2

Author

Weber, Thorsten, Czasch, A O, Jagutski, O, Muller, A K, Mergel, V, Kheifets, Anatoli, Feagin, E, Rotenberg, E, Meigs, George, Prior, M, Daveau, Sebastian, Landers, A L, Cocke, C L, Osipov, T, Schmidt-Böcking, H, Dorner, R, Weber, Thorsten, Czasch, A O, Jagutski, O, Muller, A K, Mergel, V, Kheifets, Anatoli, Feagin, E, Rotenberg, E, Meigs, George, Prior, M, Daveau, Sebastian, Landers, A L, Cocke, C L, Osipov, T, Schmidt-Böcking, H, and Dorner, R

Abstract

We report the first kinematically complete study of the four-body fragmentation of the D2 molecule following absorption of a single photon. For equal energy sharing of the two electrons and a photon energy of 75.5 eV, we observed the relaxation of one of the selection rules valid for He photo-double-ionization and a strong dependence of the electron angular distribution on the orientation of the molecular axis. This effect is reproduced by a model in which a pair of photoionization amplitudes is introduced for the light polarization parallel and perpendicular to the molecular axis.

Published
2004

43. Many-Particle Dynamics in Atomic and Molecular Physics Investigated with the COLTRIMS-Technique: New Inside into e-e- Correction

Author

Schmidt-Böcking, H, Dorner, R, Jagutski, O., Jahnke, T., Mergel, V, Schmidt, L Ph H, Weber, Thorsten, Czasch, A O, Wimmer, C, Hattass, M., Knapp, A, Schoffler, M S, Cocke, C L, Prior, Michael, Kheifets, Anatoli, Weigold, Erich, Afaneh, F, Schmidt-Böcking, H, Dorner, R, Jagutski, O., Jahnke, T., Mergel, V, Schmidt, L Ph H, Weber, Thorsten, Czasch, A O, Wimmer, C, Hattass, M., Knapp, A, Schoffler, M S, Cocke, C L, Prior, Michael, Kheifets, Anatoli, Weigold, Erich, and Afaneh, F

Published
2004

44. Complete Photo-Fragmentation of the Deuterium Molecule

Author

Weber, Thorsten, Czasch, A O, Jagutski, O., Muller, A K, Mergel, V, Kheifets, Anatoli, Rotenberg, E, Meigs, George, Prior, M H, Daveau, Sebastian, Landers, A L, Cocke, C L, Osipov, T, Diez-Muino, Ricardo, Schmidt-Böcking, H, Dorner, R, Weber, Thorsten, Czasch, A O, Jagutski, O., Muller, A K, Mergel, V, Kheifets, Anatoli, Rotenberg, E, Meigs, George, Prior, M H, Daveau, Sebastian, Landers, A L, Cocke, C L, Osipov, T, Diez-Muino, Ricardo, Schmidt-Böcking, H, and Dorner, R

Abstract

All properties of molecules - from binding and excitation energies to their geometry - are determined by the highly correlated initial-state wavefunction of the electrons and nuclei. Details of these correlations can be revealed by studying the break-up of these systems into their constituents. The fragmentation might be initiated by the absorption of a single photon1-6, by collision with a charged particle7,8 or by exposure to a strong laser pulse9,10: if the interaction causing the excitation is sufficiently understood, the fragmentation process can then be used as a tool to investigate the bound initial state11,12. The interaction and resulting fragment motions therefore pose formidable challenges to quantum theory13,15. Here we report the coincident measurement of the momenta of both nuclei and both electrons from the single-plioton-induced fragmentation of the deuterium molecule. The results reveal that the correlated motion of the electrons is strongly dependent on the inter-nuclear separation in the molecular ground state at the instant of photon absorption.

Published
2004

46. Dynamics of Ionization Processes Studied with the COLTRIMS Method - New Insight into e-e Correlation

Author

Schmidt-Böcking, H, Mergel, V, Schmidt, L Ph H, Dorner, R, Jagutski, O., Ullmann, K, Weber, Thorsten, Ludde, H J, Weigold, Erich, Kheifets, Anatoli, Schmidt-Böcking, H, Mergel, V, Schmidt, L Ph H, Dorner, R, Jagutski, O., Ullmann, K, Weber, Thorsten, Ludde, H J, Weigold, Erich, and Kheifets, Anatoli

Abstract

Many particle dynamics in atomic and molecular physics has been investigated by using the COLTRIMS method. The method and its power is discussed. The COLTRIMS technique visualizes many-particle fragmentation processes in the eV and sub milli-eV regime and reveals like the bubble chamber the complete momentum pattern in atomic and molecular particles reactions. Complete differential cross sections in momentum space have been measured for the transfer ionization channel in fast four-body (p+He→H°+He2++e) collisions. The correlated kinematical transfer ionization channel has been used to probe the highly correlated contributions to the asymptotic parts (high momenta and large nuclear impact parameters) of the He ground-state momentum wave function. In this reaction, one electron with selected initial momentum (2.5-7.5a.u.) in the He ground state is kinematically captured by the proton (tunneling through the two-center barrier). The measured three-particle final-state momentum distributions show well-structured patterns, which reflect special features of the three-particle initial-state momentum wave function.

Published
2003

47. Revealing the Non-s 2 Contributions in the Momentum Wave Function of Ground-state He

Author

Schmidt-Böcking, H, Mergel, V, Dorner, R, Cocke, C L, Jagutski, O., Schmidt, L Ph H, Weber, Thorsten, Ludde, H J, Weigold, Erich, Berakdar, J., Cederquist, H., Schmidt, H T, Schuch, R, Kheifets, Anatoli, Schmidt-Böcking, H, Mergel, V, Dorner, R, Cocke, C L, Jagutski, O., Schmidt, L Ph H, Weber, Thorsten, Ludde, H J, Weigold, Erich, Berakdar, J., Cederquist, H., Schmidt, H T, Schuch, R, and Kheifets, Anatoli

Abstract

The correlated Tunneling Transfer Ionization (TuTI) channel in fast 4-body processes p + He → H0 + He2+ +e is utilized to probe the highly correlated asymptotic parts of the He ground-state momentum space wave function. In this reaction, predominantly a

Published
2003

50. Experimental investigation of the asymptotic momentum wavefunction of the He Ground State

Author

Schmidt-Böcking, H, Mergel, V, Dorner, R, Jagutski, O., Schmidt, L Ph H, Weber, Thorsten, Cocke, C L, Ludde, H J, Weigold, Erich, Popov, Y V, Cederquist, H., Schmidt, H T, Schuch, R, Berakdar, J., Schmidt-Böcking, H, Mergel, V, Dorner, R, Jagutski, O., Schmidt, L Ph H, Weber, Thorsten, Cocke, C L, Ludde, H J, Weigold, Erich, Popov, Y V, Cederquist, H., Schmidt, H T, Schuch, R, and Berakdar, J.

Published
2002

Catalog

Books, media, physical & digital resources
See catalog results