The hydrogen molecule under the reaction microscope: single photon double ionization at maximum cross section and threshold (doubly differential cross sections)

Weber, Thorsten; Foucar, Lutz; Jahnke, Till; Schoeffler, Markus; Schmidt, Lothar; Prior, Michael; Doerner, Reinhard

doi:10.1088/1361-6455/aa7e3b

Title: The hydrogen molecule under the reaction microscope: single photon double ionization at maximum cross section and threshold (doubly differential cross sections)

Journal Article · Fri Jul 07 00:00:00 EDT 2017 · Journal of Physics. B, Atomic, Molecular and Optical Physics

DOI:https://doi.org/10.1088/1361-6455/aa7e3b· OSTI ID:1435090

Weber, Thorsten ^[1]; Foucar, Lutz ^[2]; Jahnke, Till ^[2]; Schoeffler, Markus ^[2]; Schmidt, Lothar ^[2]; Prior, Michael ^[1]; Doerner, Reinhard ^[2]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
Goethe Univ. Frankfurt (Germany). Inst. of Nuclear Physics

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.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1435090

Journal Information:: Journal of Physics. B, Atomic, Molecular and Optical Physics, Vol. 50, Issue 16; ISSN 0953-4075

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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Title: The hydrogen molecule under the reaction microscope: single photon double ionization at maximum cross section and threshold (doubly differential cross sections)

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