with incident light of 405 and 365 nm were studied quantitatively in matrices of 6M LiCl, 4M CH3COONa, and C2H5OH. the radical-anions were shown to undergo reaction of S–S and S–H bond dissociation. Relative efficiency of the observed processes depends on the energy of incident light, on the nature of matrix, and on the degree of self-association of hydrogen sulphide.