Infrared spectra of matrix-isolated monomeric and dimeric hydrogen sulfide in solid O2

Abstract

FTIR spectra of the matrix-isolated monomeric and complexed H2S in solid O2 at 13 K have been obtained at various matrix: solute ratios (M/S) in order to identify the ν3 absorption of the monomer. The ν1 absorption of the monomer was too weak to be seen at high dilutions, M/S∼4000 and 8000. The previous assignments of the monomer ν1 absorption in Ar and N2 are questioned. The satellite peaks appearing at low values of (M/S) are assigned to (H2S)2. The observed H-bonding dimer frequency, −50 cm−1 from v3, is comparable to the value calculated using second-order Mo/ller-Plesset perturbation theory. Frequencies calculated at the Hartree–Fock level for H2S dimer are essentially unchanged from those in the monomer.