H2CO rotational excitation by H2

Details H2CO rotational excitation by H2 H2CO rotational excitation by H2

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..263t&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

Since its discovery in 1969, the abnormal absorption of H2CO in dark clouds has remained an open problem owing to the lack of accurate collisional rates. We aim to assess the influence of H2CO-H2 collisional rates on the pumping scheme of Townes & Cheung (1969). Full converged close-coupling calculation based on a high accuracy potential energy surface have been performed for H2CO colliding with para(J=0,2)- and ortho(J=1)-H2. Rotational rates for transitions among the five lowest doublets of ortho-H2CO and for kinetic temperatures between 5 K and 50 K are obtained and discussed.

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