Rotational excitation of CS and SiO by collisions with Helium

Details Rotational excitation of CS and SiO by collisions with Helium Rotational excitation of CS and SiO by collisions with Helium

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..227d&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

The modelisation of line intensities as a result of molecular excitation calculations requires accurate values of the radiative transfer coefficients and collisional excitation rates, corresponding to collisional processes with the most abundant neutral species, He and H_2. We present new sets of rotational excitation rate coefficients for the SiO-He and CS-He colliding systems, calculated among the 31 (CS) and 26 (SiO) first rotational states for temperatures ranging from 5 to 300 K. These data were obtained from reliable quantum chemical calculations, using 2D SiO-He and CS-He potential energy surfaces and close-coupling calculations of the collisional excitation cross sections. Features of the obtained excitation cross sections, such as their associated propensity rules, were further analyzed.

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