State-selected reactive scattering. II. He+H sup + sub 2 r arrow HeH sup + +H

Journal Article · Tue Oct 01 04:00:00 EDT 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461705· OSTI ID:5220833

Pollard, J E; Johnson, L K; Cohen, R B ^[1]

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1. The Aerospace Corporation, P.O. Box 92957, M5/754, Los Angeles, California (USA)

The endoergic reaction He+H{sup +}{sub 2}{r arrow}HeH{sup +}+H is investigated in a molecular-beam experiment as a function of H{sup +}{sub 2} vibrational energy at c.m. collision energies between 0.3 and 1.9 eV. Reactant ions generated by resonantly enhanced four-photon ionization are impulsively accelerated to collide with a beam of He. Time-of-flight velocity distributions of HeH{sup +}, measured at one laboratory angle, yield the differential cross section at c.m. angles {theta}=0{degree} and 180{degree}. A shift from He rebound'' to H{sup +} stripping'' behavior accompanies the enhancement in the cross section as the H{sup +}{sub 2} vibrational energy increases, which matches previous studies at higher collision energy. Small-impact-parameter events produce HeH{sup +} with less recoil velocity (more internal energy) than those at large impact parameters. Within the limits of sensitivity and resolution ({Delta}{ital E}{approx}0.15 eV), definitive resonance features in the collision energy dependence of {ital d}{sigma}/{ital d}{omega} are not evident. Improvements in the technique to enable such observations are suggested.

• OSTI ID: 5220833
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:7; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DISTRIBUTION
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EXCITED STATES
FLUIDS
GASES
HELIUM
HELIUM COMPOUNDS
HELIUM HYDRIDES
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN IONS
HYDROGEN IONS 2 PLUS
HYDROGEN TRANSFER
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
MILLI EV RANGE
MOLECULAR IONS
MOLECULE COLLISIONS
NONMETALS
RARE GAS COMPOUNDS
RARE GASES
VIBRATIONAL STATES