6533b7d8fe1ef96bd126ac28
RESEARCH PRODUCT
Rotational excitation of mono- and doubly-deuterated water by hydrogen molecules
Cecilia CeccarelliLaurent WiesenfeldYohann ScribanoAlain Fauresubject
PhysicsHydrogen moleculeAstronomy and Astrophysics010402 general chemistry01 natural sciences0104 chemical scienceslaw.inventionInteraction potentialOrders of magnitude (time)DeuteriumSpace and Planetary Sciencelaw0103 physical sciencesRadiative transferMaserAtomic physics010303 astronomy & astrophysicsExcitationdescription
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 coupledstates 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 (11,0–11,1) transition.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-12-01 | Monthly Notices of the Royal Astronomical Society |