Analysis of the far infrared H/sub 2/--He spectrum

Journal Article · Mon Nov 15 04:00:00 EST 1982 · J. Chem. Phys.; (United States)

OSTI ID:6769174

Cohen, E R; Frommhold, L; Birnbaum, G

Previous measurements of the far infrared absorption due to H/sub 2/--He collisions at the temperatures of 77, 195, and 292 K are analyzed. The spectra are fitted by a semiempirical line shape representing the isotropic induced overlap component and combined anisotropic quadrupolar and overlap components. The experimental spectral moments are evaluated and compared with theory for several induced-dipole and potential models. From the isotropic contribution, the range and strength of the induced dipole is evaluated and compared with the results of ab initio calculations. Fitting parameters are obtained with physically plausible temperature dependences which allow simple and accurate representation of the spectra and of their moments at temperatures different from those of the measurements.

• Research Organization: Science Center, Rockwell International, Thousand Oaks, California 91360
• OSTI ID: 6769174
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 77:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
DIMERS
ELEMENTS
FLUIDS
GASES
HELIUM
HYDROGEN
INFRARED SPECTRA
LINE WIDTHS
LOW TEMPERATURE
MEDIUM TEMPERATURE
MOLECULE COLLISIONS
NONMETALS
RARE GASES
SPECTRA
TEMPERATURE DEPENDENCE