On the near ultraviolet photodissociation of hydrogen sulphide

Abstract

The near ultraviolet photolysis of H2S has been investigated further, at nine different excitation wavelengths in the range 244-198 nm and at yet higher resolution than hitherto, using the technique of H (Rydberg) atom photo-fragment translational spectroscopy. Analyses of the total kinetic energy release spectra of the primary H + SH fragments has allowed further refinement of the parent bond dissociation energy, D00(HS-H) = 31440 ± 20 cm-1, and revealed a marked correlation between the wavelength dependence of , the fraction of the available energy partitioned into SH(X) product vibration, and the first of the diffuse vibronic structures evident in the UV absorption spectrum of the H2S parent. Secondary photolysis of the primary SH(X) fragments has also been investigated further. 2 + 1 Resonance enhanced multiphoton ionization spectroscopy has been used to confirm that the S(3P) atoms resulting from 218⋅2 nm photolysis of the primary SH(X) fragments are formed in all three spin-orbit states, with...