Electron capture in collisions of S with H{sup +}

Journal Article · Wed Jun 15 04:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.062713· OSTI ID:20717925

Zhao, L B; Stancil, P C; Gu, J -P; Liebermann, H -P; Funke, P; Buenker, R J; Kimura, M ^[1]

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1. Department of Physics and Astronomy and the Center for Simulational Physics, University of Georgia, Athens, Georgia 30602-2451 (United States)

Within the framework of a fully quantum-mechanical molecular-orbital close-coupling (QMOCC) theory, charge transfer has been studied for collisions of S with H{sup +}. The multireference single- and double-excitation configuration-interaction method was utilized to evaluate the adiabatic potentials and nonadiabatic coupling matrix elements for the SH{sup +} system. Cross sections and rate coefficients are presented for S({sup 3}P,{sup 1}D)+H{sup +}{yields}S{sup +}({sup 4}S{sup 0},{sup 2}D{sup 0},{sup 2}P{sup 0})+H with relative collision energies between 0.1 meV/u and 10 keV/u and temperatures between 10 K and 2.0x10{sup 6} K. The investigation shows that the charge-transfer process is dominated by S({sup 3}P)+H{sup +}{yields}S{sup +}({sup 2}P{sup 0})+H and that the cross sections and rate coefficients vary by orders of magnitude over the energy and temperature range considered. The current rate coefficients are in disagreement with the often adopted value of 1.30x10{sup -9} cm{sup 3}/s at low temperatures, and two orders of magnitude smaller than a previous estimate at T=10{sup 4} K, for the process S({sup 3}P)+H{sup +}{yields}S{sup +}({sup 2}D{sup 0},{sup 2}P{sup 0})+H. We also performed semiclassical close-coupling calculations, which give cross sections in excellent agreement agreement with the QMOCC results for energies above 30 eV/u. Application of the results to astrophysical environments is briefly discussed.

• OSTI ID: 20717925
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CHARGE EXCHANGE
CONFIGURATION INTERACTION
COUPLING
ELECTRON CAPTURE
EV RANGE
EXCITATION
HYDROGEN IONS 1 PLUS
ION-ATOM COLLISIONS
KEV RANGE
MATRIX ELEMENTS
MOLECULAR ORBITAL METHOD
POTENTIALS
QUANTUM MECHANICS
SEMICLASSICAL APPROXIMATION
SULFUR