The hydrogen molecule under the reaction microscope: single photon double ionization at maximum cross section and threshold (doubly differential cross sections)
Abstract
In this paper, we studied the photo double ionization of hydrogen molecules in the threshold region (50 eV) and the complete photo fragmentation of deuterium molecules at maximum cross section (75 eV) with single photons (linearly polarized) from the Advanced Light Source, using the reaction microscope imaging technique. The 3D-momentum vectors of two recoiling ions and up to two electrons were measured in coincidence. We present the kinetic energy sharing between the electrons and ions, the relative electron momenta, the azimuthal and polar angular distributions of the electrons in the body-fixed frame. We also present the dependency of the kinetic energy release in the Coulomb explosion of the two nuclei on the electron emission patterns. We find that the electronic emission in the body-fixed frame is strongly influenced by the orientation of the molecular axis to the polarization vector and the internuclear distance as well as the electronic energy sharing. Finally, traces of a possible breakdown of the Born–Oppenheimer approximation are observed near threshold.
- Authors:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
- Goethe Univ. Frankfurt (Germany). Inst. of Nuclear Physics
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); German Academic Exchange Service (DAAD); German Research Foundation (DFG); German Federal Ministry of Education and Research (BMBF)
- OSTI Identifier:
- 1435090
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. B, Atomic, Molecular and Optical Physics
- Additional Journal Information:
- Journal Volume: 50; Journal Issue: 16; Journal ID: ISSN 0953-4075
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; reaction microscopy; photo double ionization; doubly differential cross sections; ionization threshold; four-body problem; molecular frame photoelectron angular distribution; kinetic energy release
Citation Formats
Weber, Thorsten, Foucar, Lutz, Jahnke, Till, Schoeffler, Markus, Schmidt, Lothar, Prior, Michael, and Doerner, Reinhard. The hydrogen molecule under the reaction microscope: single photon double ionization at maximum cross section and threshold (doubly differential cross sections). United States: N. p., 2017.
Web. doi:10.1088/1361-6455/aa7e3b.
Weber, Thorsten, Foucar, Lutz, Jahnke, Till, Schoeffler, Markus, Schmidt, Lothar, Prior, Michael, & Doerner, Reinhard. The hydrogen molecule under the reaction microscope: single photon double ionization at maximum cross section and threshold (doubly differential cross sections). United States. https://doi.org/10.1088/1361-6455/aa7e3b
Weber, Thorsten, Foucar, Lutz, Jahnke, Till, Schoeffler, Markus, Schmidt, Lothar, Prior, Michael, and Doerner, Reinhard. Fri .
"The hydrogen molecule under the reaction microscope: single photon double ionization at maximum cross section and threshold (doubly differential cross sections)". United States. https://doi.org/10.1088/1361-6455/aa7e3b. https://www.osti.gov/servlets/purl/1435090.
@article{osti_1435090,
title = {The hydrogen molecule under the reaction microscope: single photon double ionization at maximum cross section and threshold (doubly differential cross sections)},
author = {Weber, Thorsten and Foucar, Lutz and Jahnke, Till and Schoeffler, Markus and Schmidt, Lothar and Prior, Michael and Doerner, Reinhard},
abstractNote = {In this paper, we studied the photo double ionization of hydrogen molecules in the threshold region (50 eV) and the complete photo fragmentation of deuterium molecules at maximum cross section (75 eV) with single photons (linearly polarized) from the Advanced Light Source, using the reaction microscope imaging technique. The 3D-momentum vectors of two recoiling ions and up to two electrons were measured in coincidence. We present the kinetic energy sharing between the electrons and ions, the relative electron momenta, the azimuthal and polar angular distributions of the electrons in the body-fixed frame. We also present the dependency of the kinetic energy release in the Coulomb explosion of the two nuclei on the electron emission patterns. We find that the electronic emission in the body-fixed frame is strongly influenced by the orientation of the molecular axis to the polarization vector and the internuclear distance as well as the electronic energy sharing. Finally, traces of a possible breakdown of the Born–Oppenheimer approximation are observed near threshold.},
doi = {10.1088/1361-6455/aa7e3b},
journal = {Journal of Physics. B, Atomic, Molecular and Optical Physics},
number = 16,
volume = 50,
place = {United States},
year = {Fri Jul 07 00:00:00 EDT 2017},
month = {Fri Jul 07 00:00:00 EDT 2017}
}
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