We have calculated triply differential cross sections (TDCS) and doubly differential cross sections (DDCS) for single ionization of H2 by 75-keV proton impact using the molecular three-body distorted-wave-eikonal initial-state (M3DW-EIS) approach. Previously published measured DDCS (differential in the projectile scattering angle and integrated over the ejected electron angles) found pronounced structures at relatively large angles that were interpreted as an interference resulting from the two-centered potential of the molecule. Theory treating H2 as atomic H multiplied by a molecular interference factor only predicts the observed structure when assumptions are made about the molecular orientation. Here we apply the M3DW-EIS method, which does not rely on such an ad hoc approach, but rather treats the interference from first principles.
U. Chowdhury et al., "Differential Cross Sections for Single Ionization of H₂ by 75-keV Proton Impact," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 83, no. 3, pp. 032712-1-032712-7, American Physical Society (APS), Mar 2011.
The definitive version is available at https://doi.org/10.1103/PhysRevA.83.032712
Keywords and Phrases
Ad hoc approach; Differential cross section; Distorted waves; Doubly differential cross sections; Eikonal; Ejected electrons; First-principles; Molecular interference; Proton impact; Scattering angles; Single ionization; Electrochemical corrosion; Impact ionization; Protons; Molecular orientation
International Standard Serial Number (ISSN)
Article - Journal
© 2011 American Physical Society (APS), All rights reserved.
01 Mar 2011