Calculation of associative and Penning ionization of H and D by He(2 /sup 1/S) and He(2 /sup 3/S)

Journal Article · Thu Dec 15 04:00:00 EST 1977 · J. Chem. Phys.; (United States)

OSTI ID:5261752

Hickman, A P; Morgner, H

Associative and Penning ionization cross sections are calculated for collisions of H and D with He(2 /sup 1/S) and He(2 /sup 3/S) in the energy range 0.03--1.0 eV. Ab initio configuration--interaction potential curves V* and V/sub +/ for these systems are used. For the autoionization width GAMMA, the recent results of Hickman, Isaacson, and Miller for He(2 /sup 3/S) -H are employed, and their calculations are extended to obtain the width for He(2 /sup 1/S) --H. For the latter system, the calculated associative ionization fraction and the relative energy dependence of the total ionization cross section are in excellent agreement with the recent experiments of Fort, Laucagne, Pesnelle, and Watel. Comparison with the experiments of Morgner at thermal energies, and of Howard, Riola, Rundel, and Stebbings, and Neynaber and Magnuson at higher energies suggests that GAMMA (R) for He(2 /sup 3/S) --H is fairly accurate, and that GAMMA (R) for He(2 /sup 1/S) --H is low by about a factor of 2.

• Research Organization: Molecular Physics Center, SRI International, Menlo Park, California 94025
• OSTI ID: 5261752
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 67:12; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
AUTOIONIZATION
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
DEUTERIUM
ELEMENTS
FLUIDS
HELIUM
HYDROGEN
HYDROGEN ISOTOPES
IONIZATION
ISOTOPES
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PENNING EFFECT
RARE GASES
STABLE ISOTOPES
TOTAL CROSS SECTIONS