Energy corrected sudden calculations of linewidths and line shapes based on coupled states cross sections: The test case of CO2–argon

Abstract

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Intensity Measurements and Collision-Broadening Coefficients for the Oxygen A Band Measured by Intracavity Laser Absorption Spectroscopy

“…Both Bonamy et al (27) and DePristo et al (24) use approximations to derive adiabaticity factors, but the behavior of the Bonamy factor is more reason-able for high J lines. The Bonamy factor has recently been applied to the CO 2 -Ar system by Thibault et al (28). They computed ab initio basis rates from a good potential and compared scaling laws to these computations and to experimental data.…”

Experimental and theoretical study of line mixing in NH3 spectra. I. Scaling analysis of parallel bands perturbed by He

“…20 Finally note that for simple systems direct computations of the relaxation matrix have been made using purely quantal approaches and a known potential energy surface. 33,34 The model used in the present work to predict the shape of NH 3 spectra is based on the IOS approach improved by introducing corrections in order to satisfy the detailed balance relation and modified to correct for the energy sudden approximation ͑account for the finite spacing between energy levels͒. The basic equations have been given in Refs.…”

FTIR Measurements of N2-Induced Pressure Broadening of Allene (C3H4) in the ν10 Band

“…The essential factor could lie in certain special intermolecular force contributions, apart from considerable measurement uncertainties. Comprehensive studies involving the intermolecular potential can be carried out based on the widely used semiclassical ATC (29) or Robert-Bonamy (30) theories, or by the direct close-coupling calculation of the inelastic collision cross sections (31). At the present stage, we could not anticipate what actually causes this "unorthodox" feature of the current N 2 -broadening coefficients, because of the complicated molecular scattering process as described by quantum mechanics (32).…”