Can we estimate rate coefficients for collisions with para-H2(J=0) from Helium rate coefficients ? Application to SiS

Details Can we estimate rate coefficients for collisions with para-H2(J=0) from Helium rate coefficients ? Application to SiS Can we estimate rate coefficients for collisions with para-H2(J=0) from Helium rate coefficients ? Application to SiS

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..272v&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

The theoretical determination of collisional rate coefficients is a two steps process: determination of the interaction potential V between the colliding systems and calculation of the collision dynamics. In the interstellar medium, the dominant collision partner is H3but only few data are available for collisions with H2. If data for collisions with He are available, it is often proposed to use He-rate coefficients with the appropriate reduced mass correction as a first estimate of rate coefficients with H2(j=0). This approximation assumes that He- and H2-collisions have the same cross sections. As shown from our recent results on SiS in collision with He and H2(j=0), some caution may be exercised concerning this approximation.

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