Absorption coefficient and intermolecular vibrations in the СО-Ar system
O.B. Rodimova
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: fundamental CO band wing, the He broadening, spectral line wings, second virial coefficient, potential energy surface
Abstract
Absorption in the 1-0 band of CO broadened by Ar is examined using the asymptotic line wing theory. An expression for the line shape is derived within the asymptotic line-wing theory (ALWT) when the center of mass motion is considered as classical whereas the other variables remain quantum. The line shape parameters are fitted to reach agreement between calculated and experimental data on the absorption in the CO band wing. The classical potential parameters are found from the temperature dependence of the second virial coefficient. A qualitative agreement is found between the quantum potential parameters and intermolecular potential surfaces from quantum-chemical calculations.
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