Triple differential study of ionization of H2 by proton impact for varying electron ejection geometries

• Published in: Journal of physics. B, Atomic, molecular, and optical physics Vol. 47; no. 21
• Main Authors: Hasan, A, Sharma, S, Arthanayaka, T P, Lamichhane, B R, Remolina, J, Akula, S, Madison, D H, Schulz, M
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 14.11.2014; Institute of Physics
• Subjects: Atomic and molecular collision processes and interactions; Atomic and molecular physics; Electronic excitation and ionization of molecules; intermediate molecular states (including lifetimes, state mixing, etc.); Exact sciences and technology; few body problem; fully differential cross sections; ionization; Physics; Scattering of atoms, molecules and ions; Protons; Inorganic compounds; Triply differential cross section; Hydrogen Molecules; Ionization; N-body problems; Ion-molecule collisions; Diatomic molecules; Strong coupling
• ISSN: 0953-4075; 1361-6455
• DOI: 10.1088/0953-4075/47/21/215201

We have performed a kinematically complete experiment on ionization of H2 by 75 keV proton impact. The triple differential cross sections (TDCS) extracted from the measurement were compared to a molecular 3-body distorted wave (M3DW) calculation for three different electron ejection geometries. Overall, the agreement between experiment and theory is better than in the case of a helium target for the same projectile. Nevertheless, significant quantitative discrepancies remain, which probably result from the capture channel, which may be strongly coupled to the ionization channel. Therefore, improved agreement could be expected from a non-perturbative coupled-channel approach.