Theoretical calculations of pressure broadening coefficients for H2O perturbed by hydrogen or helium gas.

Computer Science

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Water Vapor: Line Broadening, Water Vapor: Planetary Atmospheres

Scientific paper

To aid in the reduction of remote-sensing data from the outer planets, collision-broadened halfwidths are calculated for water vapor broadened by H2 and are estimated for He-broadening. The model used is a fully complex implementation of the Robert and Bonamy formalism with parabolic trajectories and all relevant terms in the interaction potential. Calculations are performed for 386 pure rotational transitions of H2O with J″0 to 14 and Ka″0 to 8. In addition, the temperature dependence of the halfwidth is computed for a temperature range from 200 to 750 K for 33 transitions with J″1 to 10 and Ka″0 to 8. The calculations are compared with known measurements of pure rotational and ν2 lines and good agreement is observed (-2 and -4% difference respectively). Finally, methods for estimating halfwidths for H2 and He-broadening are presented.

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