Coupling of discrete and continuum electronic states in atom-atom collisions: A coupled-channels investigation of Penning ionization in He* (1s2s,/sup 3/S) + Ar
Transitions among discrete and continuum electronic states of diatomics induced by atom-atom collisions and leading to ionization, are described by rigorously making the continuous electron energies epsilon discrete. An expansion in functions of epsilon leads to a set of coupled-channel scattering equations which may be solved to obtain differential and integral cross sections per unit of electron energies. This procedure is applied to Penning ionization in He* (1s2s,/sup 3/S) + Ar collisions by choosing a suitable expansion basis and numerically integrating a selected set of coupled equations. Results confirm the Franck-Condon nature of electron emission used in previous theoretical analyses. They were obtained with a parametrized exponential coupling potential between the states of HeAr* and HeAr + e/sup -/. The calculations include total integral cross sections per unit electron energies and the contribution of individual partial waves at a given final energy. These cross sections show prominent features that may be related to the potential of the product heavy particles.
- Research Organization:
- Quantum Theory Project, Departments of Physics and Chemistry, University of Florida, Gainesville, Florida 32611
- OSTI ID:
- 6680676
- Journal Information:
- Phys. Rev., A; (United States), Vol. 18:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ARGON
ATOM-ATOM COLLISIONS
HELIUM
DIFFERENTIAL CROSS SECTIONS
ENERGY-LEVEL TRANSITIONS
INTEGRAL CROSS SECTIONS
IONIZATION
PENNING EFFECT
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
NONMETALS
RARE GASES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena