New Model of Collision-Induced Infrared Absorption Spectra of H2 He Pairs in the 2-2.5 μm Range at Temperatures from 20 to 300 K: An Update

Document Type

Article

Publication Date

4-1992

Department

Department of Physics

Abstract

A revised numerical method to calculate the collision-induced absorption rotovibrational (RV CIA) spectra of H2 He pairs in the fundamental band of hydrogen, at temperatures from 20 to 300 K is presented. The paper corrects few inaccuracies which exist in the previous modeling of the H2 He absorption in this frequency range. New computations account for the previously neglected J-dependence of the vibrational matrix elements of the induced dipoles. Model spectra are presented which reproduce closely the latest quantum mechanical results and are found to agree with most experimental CIA coefficients of H2 He to within a few percent. The numerical model uses simple analytical model lineshapes and can generate the RV CIA spectra of H2 He extremely efficiently. A FORTRAN program, H2HE01, utilizing the described method is available upon request from the author. This work is of interest for the modeling of the atmospheres of the outer planets in the near-infrared region of the spectrum.

Publisher's Statement

© 1992

Publication Title

Icarus

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