Potential energy curves for the collisional excitation of the (HeNe)/sup +/ system. [configuration-interaction method, curve crossing interference]
The adiabatic spectrum of potential energy curves, corresponding to the /sup 2/..sigma../sup +/ and /sup 2/Pi states of the molecular complex, have been calculated using an ab initio configuration-interaction method. Curve-crossing phenomena are found in all the curves with the exception of the lowest /sup 2/..sigma../sup +/ state, corresponding to the Ne/sup +/(/sup 2/P) + He(/sup 1/S) asymptotic level. An approximate threshold of 22 eV is predicted for the neon /sup 1/S to /sup 1/P excitation, which is in good agreement with available experimental predictions. The charge-exchange excitation of Ne in the Ne/sup +/ + He collision occurs at about 29 eV in the /sup 2/Pi state for an internuclear separation of 1.5a/sub 0/. Three additional crossings for the /sup 2/Pi spectrum are also found at lower energy and larger separation. The cross section for the first /sup 2/..sigma../sup +/ crossing is calculated as a function of collision energy using the Landau-Zener-Stueckelberg method, and including the phase-interference effect. Phase-interference (''Stueckelberg'') oscillations are found in the cross section and are in qualitative agreement with oscillations found in the experimental cross sections. (AIP)
- Research Organization:
- Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
- OSTI ID:
- 7344758
- Journal Information:
- Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 14:3; 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
ATOM COLLISIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
HELIUM
INTERATOMIC FORCES
INTERFERENCE
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
NEON IONS
NONMETALS
OSCILLATIONS
POTENTIAL ENERGY
RARE GASES