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New potential energy surface for the HCS(+)-He system and inelastic rate coefficients
Marie-Lise Dubernet1, Ernesto Quintas-Sánchez1, Philip Tuckey2
1LERMA, UMR8112, PSL Research University, Observatoire de Paris, Sorbonne Universités, UPMC Univ Paris 06, CNRS, 5 Place Janssen, 92195 Meudon, France.
Abstract:
A new high quality potential energy surface is calculated at a coupled-cluster single double triple level with an aug-cc-pV5Z basis set for the HCS(+)-He system. This potential energy surface is used in low energy quantum scattering calculations to provide a set of (de)-excitation cross sections and rate coefficients among the first 20 rotational levels of HCS(+) by He in the range of temperature from 5 K to 100 K. The paper discusses the impact of the new ab initio potential energy surface on the cross sections at low energy and provides a comparison with the HCO(+)-He system. The HCS(+)-He rate coefficients for the strongest transitions differ by factors of up to 2.5 from previous rate coefficients; thus, analysis of astrophysical spectra should be reconsidered with the new rate coefficients.
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