2002A&A...395.1031Y

Fifteen reactions on the doublet HC_nS and singlet/triplet H₂C_nS (n=1,2) potential energy surfaces have been investigated theoretically via electronic structure calculations to unravel the formation of hydrogen deficient, sulfur bearing molecules via bimolecular reactions of two neutral species in cold molecular clouds. Various barrierless reaction pathways to synthesize astronomically observed C_nS and hitherto undetected HC_nS (n=1,2) isomers are offered. These data present important guidance to search for rotational transitions of the elusive thioformyl HCS(X²A') and thioketenyl HCCS(X²Π) radicals in the interstellar medium.