H2CO and H2: a story of excitation

Details H2CO and H2: a story of excitation H2CO and H2: a story of excitation

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe.131t&link_type=abstract

"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782

Astronomy and Astrophysics

Astrophysics

Modelling_Interactions

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 cross sections 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 cross sections 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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