New analysis of the spectral moments of collision induced absorption in gaseous N < inf> 2 and CO < inf> 2

Document Type

Article

Publication Date

1-1-1996

Abstract

The experimental values of the two lowest spectral moments of the far infrared collision induced absorption spectra of gaseous N2 and CO2 are compared with results from analytical formulas (A. Borysow and M. Moraldi, 1992, Phys. Rev. Lett., 68, 3686) allowing for the anisotropic intermolecular potential. A purely electrostatic induction mechanism was sufficient to reproduce the experimental values of the spectral moments of N2. For CO2, in order to achieve similar agreement, an overlap contribution to the induction terms was introduced. These new terms provide a correction to the present authors' earlier results (M. Gruszka and A. Borysow, 1994, J. chem. Phys., 101, 3573), where no overlap was used. The impact of the anisotropy of the intermolecular potential on the spectral moments of N2 and CO2 has been analysed, and also the applicability of perturbation theory for computing the spectral moments. In both cases, N2 and CO2, it was found that the perturbation series does not converge, when realistic interaction potentials are used. © 1996 Taylor & Francis Group, LLC.

Publication Title

Molecular Physics

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