Energy-modified adiabatic approximation for scattering theory
The adiabatic approximation in scattering theory is modified by allowing for the splitting and shifts of perturbed target-state energy levels. This energy-modified adiabatic approximation, derived from operator equations formally equivalent to close-coupling equations in the basis of perturbed target states, is shown to be qualitatively correct for threshold and resonance structures, for which the usual adiabatic theory is inadequate. In the case of electron-molecule vibrational excitation, it is shown that electronic threshold scattering structures should be associated with each vibrational threshold. A single electronic resonance becomes a manifold of multichannel vibrational excitation resonances. Vibrational excitation structures in e/sup -/-N/sub 2/ scattering are computed as an example of the method.
- Research Organization:
- IBM Research Laboratory, San Jose, California 95193
- OSTI ID:
- 6467460
- Journal Information:
- Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 19:2; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ADIABATIC APPROXIMATION
COLLISIONS
CRYOGENIC FLUIDS
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUIDS
MOLECULE COLLISIONS
NITROGEN
NONMETALS
VIBRATIONAL STATES