An Experimental Investigation of Collisions of NH3 with Para-H2 at the Temperatures of Cold Molecular Clouds

Details An Experimental Investigation of Collisions of NH3 with Para-H2 at the Temperatures of Cold Molecular Clouds An Experimental Investigation of Collisions of NH3 with Para-H2 at the Temperatures of Cold Molecular Clouds

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apjs..139..191w&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 139, Issue 1, pp. 191-197.

Astronomy and Astrophysics

Astronomy

6

Ism: Molecules, Molecular Data, Molecular Processes

Scientific paper

Experimentally measured cross sections for collisional broadening of ammonia by J=0, para-H2 are presented for the (J,K)=(1,1),(2,2), and (3,3) NH3 inversion transitions at temperatures from 12.5 to 40 K. The cross sections were obtained in a quasi-equilibrium environment utilizing the collisional cooling technique. These are the first laboratory measurements of interactions between NH3 and J=0, para-H2 at the temperatures of cold molecular clouds. The measured cross sections are compared to theoretical predictions using two existing ab initio NH3-H2 potential surfaces and to previously measured He broadening cross sections. In comparison to He broadening cross sections at these temperatures, the para-H2 results are up to 4 times larger. This is in contrast to 300 K experimental results where para-H2 cross sections are only 50% larger than He.

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