Elastic and inelastic processes in H{sup +}+C{sub 2}H{sub 2} collisions below the 1.5-keV regime
- School of Allied Health Sciences, Yamaguchi University, Ube 755, Yamaguchi (Japan)
- Theoretische Chemie, Bergische Universitaet-Gesamthochschule Wuppertal, D-42097 Wuppertal (Germany)
Electron capture and direct elastic scattering in collisions of H{sup +} ions with C{sub 2}H{sub 2} molecules are studied by using a molecular representation within a fully quantum-mechanical approach below 1.5 keV. Calculations are carried out at two different molecular configurations: (i) {ital C}{sub 00{ital v}} symmetry, in which H{sup +} approaches the H atom along a C{emdash}H bond in the acetylene (C{sub 2}H{sub 2}), and (ii) {ital C}{sub 2{ital v}} symmetry, in which H{sup +} approaches perpendicularly toward the midpoint between two carbon atoms. We find that electron capture in the {ital C}{sub 00{ital v}} symmetry configuration takes place preferentially over that in the {ital C}{sub 2{ital v}} symmetry configuration at scattering angles above 15{degree}. The results for the {ital C}{sub 2{ital v}} and {ital C}{sub 00{ital v}} symmetries are comparable in magnitude below 10{degree}, although the {ital C}{sub 2{ital v}} symmetry dominates slightly at still smaller angles. Hence, interferences arising from these molecular configurations in differential cross sections for electron capture and elastic scattering processes are strongly present at angles smaller than a few degrees. Accordingly, the total cross section for the {ital C}{sub 2{ital v}} symmetry is larger by a factor of 3 at 1 keV, and the difference widens as the energy decreases to the eV regime. This is because in {ital C}{sub 2{ital v}} symmetry, H{sup +} can have a larger overlap with the charge distribution of the C{sub 2}H{sub 2} molecule, thus causing a stronger interaction. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 397550
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 6 Vol. 54; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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