Molecular reorientation cross sections in collisions of He([sup 1][ital S])+D[sub 2]([ital B] [sup 1][Sigma][sup +][sub [ital u]]), HD([ital B] [sup 1][Sigma][sup +][sub [ital u]])

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.468484· OSTI ID:6939061

Odutola, J A; Lester, Jr, W A ^[1]

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1. Chemical Sciences Division, Lawrence Berkeley Laboratory and Department of Chemistry, University of California, Berkeley, Berkeley, California 94720 (United States)

Reorientation cross sections for He--D[sub 2]([ital B]) and He--HD([ital B]) are reported for the energy range of 0.302[times]10[sup [minus]3]--0.300 eV. The single surface scattering model and coupled-channel method used for the He--H[sub 2]([ital B]) [J. Chem. Phys. [bold 99], 2632 (1993)] are also used for these systems. At 295 K the calculated reorientation cross section for He--D[sub 2]([ital B]) is 45.4 A[sup 2] and the Boltzmann average is 39.5 A[sup 2]. The Boltzmann average value is to be compared with the measurement by Pibel and Moore of 27.6[plus minus]10.8 A[sup 2] [J. Chem. Phys. [bold 93], 4804 (1990)]. The corresponding cross section calculated for He--HD([ital B]) is 29.5 A[sup 2] and the Boltzmann average is 29.3 A[sup 2]. The latter is in good agreement with the experimental determination of 33.2[plus minus]5.0 A[sup 2]. Because of the rotational transition that is open for the HD target, many more open channels had to be considered to achieve convergence compared to the H[sub 2] and D[sub 2] targets.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6939061
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 101:11; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
COUPLED CHANNEL THEORY
CROSS SECTIONS
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HELIUM
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RARE GASES
ROTATIONAL STATES
SCATTERING
STABLE ISOTOPES
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K