Abstract
The transient spectrum of irradiated liquid hydrogen sulfide at −70°C shows a single broad absorption band extending from 280 to 600 nm with a maximum at 380 nm. This band is not influenced by electron scavengers. The lack of solvated electron formation is related to the high electron affinity of H 2S. The 380 nm band is attributed to the species H 2S − S for which a fast mechanism of successive reactions involving neighbouring solvent molecules is proposed. The decay mechanism of this species is also discussed in relation with a stable absorption band observed a 280 nm during 40 μs.
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