Ro-vibrational excitation of CS by He

Details Ro-vibrational excitation of CS by He Ro-vibrational excitation of CS by He

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...462.1179l&link_type=abstract

Astronomy and Astrophysics, Volume 462, Issue 3, February II 2007, pp.1179-1185

Astronomy and Astrophysics

Astrophysics

17

Ism: Molecules, Molecular Data, Molecular Processes

Scientific paper

Context: Over the next few years, ALMA and Herschel missions will perform high spatial and spectral resolution studies at infrared and sub-millimeter wavelengths. Modeling of the spectra will require accurate radiative and collisional rates for species of astrophysical interest. Aims: The present paper focuses on the calculation of ro-vibrational excitation rate coefficients of CS by He, useful for studies of high-temperature interstellar environments. Methods: A new accurate three dimensional (3D) potential energy surface for the CS-He system, which explicitly takes into account the r-dependence of the CS vibration, was calculated. The dynamic calculations were performed using the VCC-IOS approximation. Results: Cross sections among the 38 first rotational levels of v=0, v=1 and v=2 are calculated for total energies up to 10 000 cm-1. Rate coefficients between the ro-vibrational levels are calculated for temperatures from 300 K to 1500 K.

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