Rotational excitation of sulfur monoxide by collisions with Helium at low temperature

Details Rotational excitation of sulfur monoxide by collisions with Helium at low temperature Rotational excitation of sulfur monoxide by collisions with Helium at low temperature

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..243l&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

We present cross sections and collisional rates calculated with a new 2D potential energy surface for the SO-He system. Close coupling calculations of the collisional excitation cross sections of the fine structure levels of SO by He are calculated at low energies. The propensity rules for cross sections between fine-structure levels are studied and it is shown that δ N = δ j cross sections are always much larger than the other cross sections, especially for high-N rotational levels. The use of IOS recoupling techniques from spin-free cross sections is also investigated and we have shown that this method is not valid for our system at low temperature, especially for collisions involving low fine-structure levels. Excitation rates among fine-structure levels are given at low temperatures (5-50K). Finally, we show that the use of our new rate coefficients compared to the use of Green's rate coefficients can significantly change the diagnostics of the SO abundance in dark clouds.

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