The proton affinity of thioformaldehyde. Implications for the heat of formation of thioformaldehyde and thiolmethyl carbonium ion from ion cyclotron resonance investigations of the proton transfer reactions of [CH₂SH]⁺

Abstract

Abstract Ions at m / z 47 have been generated from a variety of organosulfur compounds both at 70 eV and near threshold. From observations of the energetics of proton transfer from m / z 47 to reference bases of known proton affinity, the species obtained in all cases has been shown to be [CH 2 SH] + rather than [CH 3 S] + . This result is shown to be consistent with recent ab initio calculations on these two isomers and collisional activation experiments.