Velocity dependence of the cross sections for Penning, rearrangement, and total ionization of H/sub 2/ and D/sub 2/ molecules by He (2/sup 3/S) and He (2/sup 1/S) metastable atoms

Journal Article · Wed Nov 01 04:00:00 EST 1978 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.18.2075· OSTI ID:6853601

Fort, J; Bolzinger, T; Corno, D; Ebding, T; Pesnelle, A

The velocity dependence of both the Penning and rearrangement ionization cross sections sigma/sub PI/ and sigma/sub RI/ for H/sub 2//sup ts+/ and HeH/sup +/ ion production, as well as total ionization cross section sigma/sub TI/, resulting from the collisions of He (2 /sup 1/S) and He (2 /sup 3/S) with H/sub 2/ is measured over the relative-velocity range 2400--5300 m/sec (0.04--0.20 eV energy range) in a crossed-beam experiment by a time-of-flight technique. Characteristic cross-section ratios sigma/sub RI//sigma/sub TI/ and the relative magnitude of the cross sections sigma/sub RI/, sigma/sub PI/, and sigma/sub TI/ are reported. Comparison with some recent theoretical calculations is made; we observe a fair agreement in the triplet case except for sigma/sub RI/, but a strong difference in the singlet case.

• Research Organization: Service de Physique Atomique, Centre d'Etudes Nucleaires de Saclay, Boite Postale 2, 91190 Gif sur Yvette, France
• OSTI ID: 6853601
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 18:5; 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
ATOM-MOLECULE COLLISIONS
ATOMIC BEAMS
BEAMS
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
DEUTERIUM
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
HELIUM
HYDROGEN
HYDROGEN ISOTOPES
IONIZATION
ISOTOPES
LIGHT NUCLEI
METASTABLE STATES
MOLECULAR BEAMS
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PENNING EFFECT
RARE GASES
STABLE ISOTOPES
VELOCITY