Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012mnras.420..699f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 420, Issue 1, pp. 699-704.
Astronomy and Astrophysics
Astronomy
1
Molecular Data, Molecular Processes, Stars: Formation, Ism: Molecules
Scientific paper
Rate coefficients for rotational transitions in HDO and D2O induced by H2 collisions below 300 K are presented. Calculations have been performed at the close-coupling and coupled-states levels with the deuterated variants of the H2O-H2 interaction potential of Valiron et al. The HDO-H2 and D2O-H2 rate coefficients are compared to the corresponding rate coefficients for HDO-He and H2O-H2, respectively. Significant differences are observed. In particular the new HDO rate coefficients are found to be significantly larger (by up to three orders of magnitude) than the corresponding HDO-He rate coefficients. The impact of the new HDO rate coefficients is examined with the help of non-LTE radiative transfer calculations. A number of potential HDO maser lines are finally identified, in particular the 80.6 GHz (?) transition.
Ceccarelli Cecilia
Faure Alex
Scribano Yohann
Wiesenfeld Laurent
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