Collision-induced rototranslational absorption spectra of CH4-CH4 pairs at temperatures from 50 to 300 K

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165426· OSTI ID:6016220

Borysow, A; Frommhold, L

In previous work (Borysow and Frommhold, 1986) rigorous quantum computations of the rototranslational absorption spectra of CH4-CH4 pairs have been communicated which closely reproduce existing laboratory measurements at temperatures from 124 to 300 K and over a range of frequencies from 0 to 750 per cm. Since the computations are complex, this work shows how the spectra can be reproduced from simple, analytical functions that closely model the quantum profiles and, thus, the laboratory measurements. For temperatures from 50 to 300 K, the rototranslational, collision-induced spectra of methane pairs can thus be obtained accurately on small computers in seconds. No measurements exist for comparison with the computational results at the lower temperatures (less than 124 K) but these data are believed to constitute the most dependable theoretical prediction that can presently be made. 20 references.

• Research Organization: Texas Univ., Austin
• OSTI ID: 6016220
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 318; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
ALKANES
ATMOSPHERES
CHEMICAL COMPOSITION
COLLISIONS
HYDROCARBONS
MATHEMATICAL MODELS
MECHANICS
METHANE
MOLECULE COLLISIONS
MOTION
ORGANIC COMPOUNDS
PLANETARY ATMOSPHERES
QUANTUM MECHANICS
ROTATION
SATELLITE ATMOSPHERES
SPECTRA