Collisional Excitation of H 2O by H 2 Molecules

Details Collisional Excitation of H 2O by H 2 Molecules Collisional Excitation of H 2O by H 2 Molecules

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apjs..107..467p&link_type=abstract

Astrophysical Journal Supplement v.107, p.467

Astronomy and Astrophysics

Astronomy

69

Molecular Data, Molecular Processes

Scientific paper

Using accurate theoretical rigid-rotor interaction potential for H2O-H2 and accurate coupled channel molecular scattering calculations, rates have been obtained for excitation of para- and ortho-H2O out of the lowest, j = 0, 1, and 2, rotational levels owing to collisions with para- and ortho-H2 at kinetic temperatures from 20 to 140 K. Excitation by para-H2 is not too different from excitation by He atoms, with most rates being within a factor of 1-3 larger, but excitation by is significantly different, with some rates an order of magnitude larger than rates for excitation by He atoms.

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