Calculations reveal collision dynamics affecting fine structure in SH+ due to He, suggesting temperature dependency.
The first two-dimensional potential energy surface for the interaction between He and SH+(3Σ−) has been calculated using CCSD(T)/aug-cc-pVXZ(X = T,Q,5) supplemented by a three-term extrapolation scheme. This surface is subsequently employed in close coupling calculations to investigate the collision dynamics of SH+ with He atoms. The collisional cross sections for fine structure energy levels are computed. The de-excitation rate coefficients for the lower fine structure levels of SH+ molecules due to collisions with He are determined over a temperature range of 10–500 K.
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Han et al. (2025) studied this question.
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