Spectrum of potential-energy curves for the He/sub 2/ /sup +/ system

Journal Article · Wed Dec 01 04:00:00 EST 1976 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.14.2055· OSTI ID:7329941

Blint, R J

Low-energy, collisional excitation of neutral helium in He-He/sup +/ collisions is investigated using the potential-energy curves for the molecular ions. Ground and excited states of the /sup 2/..sigma../sub g//sup +/, /sup 2/..sigma../sub u//sup +/, /sup 2/Pi/sub g/, and /sup 2/Pi/sub u/ states are calculated using an ab initio configuration-interaction method for the n = 2 neutral excitations of helium. A threshold of 23.5 eV is determined for the /sup 1/S-2 /sup 3/S excitation. Thresholds for the /sup 1/S-2 /sup 1/S, -2 /sup 3/P, and -2 /sup 1/P states are also estimated from the potential-energy curves. ..sigma..-Pi interactions are also considered to explain the photon polarization reported in the 2 /sup 1/P excitation cross section. The /sup 2/..sigma../sub g//sup +/ spectrum of potential-energy curves appears to dominate the ..sigma..-..sigma.. radial interactions, while the /sup 2/..sigma../sub u//sup +/ and /sup 2/Pi/sub u/ states are apparently necessary to explain the 2 /sup 1/P cross section. (AIP)

• Research Organization: Department of Physics and the Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
• OSTI ID: 7329941
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 14:6; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
COLLISIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUIDS
HELIUM
HELIUM IONS
INTERATOMIC FORCES
ION COLLISIONS
ION-ATOM COLLISIONS
NONMETALS
POTENTIAL ENERGY
RARE GASES