Line mixing effects in the 15 μm Q-branches of CO2 in helium: theoretical analysis.

Physics

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Carbon Dioxide: Infrared Spectra, Carbon Dioxide: Laboratory Spectra

Scientific paper

Starting from the formalism proposed by Green (1989) and based on the infinite order sudden approximation, the authors describe an improved model, based on the energy corrected sudden approximation, which allows the calculation of all types of coupling cross-sections, i.e. for stretching as well as bending bands of CO2 starting from a single set of basic rates. Predictions of that model with various experiments made on stretching bands in samples of CO2 in He had been shown to be rather good. The present paper shows that it also predicts the evolution of bending bands in these samples reasonably well, particularly that of Q branches, over a wide range of perturber density.

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