Modeling of IR absorption spectra of the mixture CO2-He at moderate and high pressures

Vladimir F. Golovko

doi:10.1117/12.548204

27 February 2004 Modeling of IR absorption spectra of the mixture CO2-He at moderate and high pressures

Vladimir F. Golovko

Proceedings Volume 5396, Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part I: Radiation Propagation in the Atmosphere and Ocean; (2004) https://doi.org/10.1117/12.548204
Event: Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2003, Tomsk, Russian Federation

Abstract

The He-broadened spectra of carbon dioxide are calculated within the pressure range 2-800 atm in the absorption regions of the bands v₂, v₃, and 3v₃ that are positioned from 590 to 7020 cm^-1. The main difficulty is consideration of the line shape narrowing at relatively high pressures. For Q-branches, this effect is observed at atmospheric conditions and, therefore, it is important for remote sounding of the gas atmosphere. The mixtures of the mentioned gases are well studied in experiments and it can serve as a good test for validating the simulating techniques developing. The line by line method is used with modeling of the single line shape without the conventional interference of lines. The problem is focused on the order and disorder in arrangement of the rotational lines with P-, R-, and Q-branches of vibrational bands. A database CDSD-1000 in the HITRAN format is reformatted with adding supplement four parameters for every entry. The physical meaning of the phenomena known as the line and branch mixing is discussed.

Citation Download Citation

Vladimir F. Golovko "Modeling of IR absorption spectra of the mixture CO2-He at moderate and high pressures", Proc. SPIE 5396, Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part I: Radiation Propagation in the Atmosphere and Ocean, (27 February 2004); https://doi.org/10.1117/12.548204

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