Calculations of temperature dependence of broadening and shift coefficients of H2O perturbed by hydrogen
V.I. Starikov
Tomsk State University of Control Systems and Radioelectronics, Tomsk, Russia
Keywords: HO, line broadening, line shift, hydrogen, temperature dependence
Abstract
Collision-broadening (γ) and shift (δ) coefficients are calculated for water vapor broadened by H2 in the spectral range 0.6-12160 cm-1 with the use of the semi-classical Robert and Bonamy formalism with exact trajectories. It is shown that calculated function γ( T ) depends on the used isotropic potential of the intermolecular interaction. Temperature parameters for 26 rotational transitions from the terahertz range were determined. An analytical model is presented that makes it possible to calculate the temperature dependence of the broadening coefficients in a wide spectral range. The temperature dependence of the average line shift was also determined. The results can be used in astrophysical application.
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