Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.382..133w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 382, Issue 1, pp. 133-138.
Astronomy and Astrophysics
Astronomy
19
Molecular Data, Shock Waves, Ism: Molecules, Cosmology: Miscellaneous
Scientific paper
We report calculations of rate coefficients for the rovibrational excitation of H2 and HD by H. The calculations relate explicitly to non-reactive scattering, excluding the proton-exchange channels. For vibrationally inelastic transitions, the new rate coefficients at T ~ 1000 K are larger than the results of earlier calculations in which the vibrational motion was treated approximately, by means of a simple harmonic oscillator model. As a result, much better agreement is obtained with the empirical estimates by Allers et al. of the rate coefficients for vibrational relaxation of the levels (v, j) = (1, 3) and (2, 3) of H2. However, the effects of the new data on the results of illustrative astrophysical models - of a C-type shock wave and of the gravitational collapse of a condensation of the primordial gas - are less pronounced than the changes to the rate coefficients for vibrationally inelastic transitions might suggest; we explain why this is the case.
Flower David R.
Gusdorf Antoine
Wrathmall Steven A.
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