Hyperfine excitation of SH+ in collisions with para- and ortho-H2
Abstract
Time-independent close-coupling quantum scattering calculations are employed to compute hyperfine-resolved rate coefficients for (de-)excitation of SH+ in collisions with para- and ortho-H2. These calculations utilized a potential energy surface for the interaction of SH+(X3Σ-) with H2 recently computed by the explicitly correlated RCCSD(T)-F12a coupled-cluster method. Rate coefficients for temperatures ranging from 10 to 500 K were calculated for all transitions among the first 37 hyperfine energy levels of SH+, with rotational angular momenta n ≤ 6, in collisions with para- and ortho-H2. As a first application of these data, the rate coefficients were employed in simple radiative transfer calculations to simulate the excitation of SH+ in typical molecular clouds.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 2019
- DOI:
- 10.1093/mnras/stz1562
- Bibcode:
- 2019MNRAS.487.3427D
- Keywords:
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- molecular data;
- molecular processes;
- ISM : abundances