Abstract
The chemistry of sulfur-bearing molecules that result from grain-mantle evaporation into warm gas is described. Evaporation of ices, in which all the available sulfur is contained in H2S, drives a hot-phase chemistry that produces SO, SO2, CS, OCS, and H2CS. It is predicted that S2 can attain significant abundances in hot cores. Large variations in abundances occur as a core evolves, and eventually almost all the original H2S is converted to SO and SO2. The SO/H2S and SO/SO2 abundance ratios could be useful as a crude molecular clock to measure the time since mantles were disrupted.
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