PHOTODISSOCIATION DYNAMICS OF H2S(D2S) FOLLOWING EXCITATION WITHIN ITS 1ST ABSORPTION CONTINUUM

The technique of H(D) atom photofragment translational spectroscopy has been applied to the photodissociation Of H2S(D2S) following excitation at a number of wavelengths in its first absorption continuum. The respective bond dissociation energies were determined as D 0(H-SH) = 3.90 ± 0.03 eV and D0(D-SD) = 4.00 ± 0.02 eV. The measured vibrational energy disposal in the partner ground state SH(SD) fragments and the product angular distributions support and extend the earlier results of van Veen et al. [Chem. Phys. 74, 261 (1983) ], while the deduced rotational and spin-orbit state population distributions in these fragments appear to be generally consistent with the recent measurements of Weiner et al. [J. Chem. Phys. 90, 1403 ( 1989 ) ]. We present a schematic adiabatic potential energy surface for the dissociative 1A ″ excited state via which it is possible to rationalize virtually all existing dynamical measurements relating to this fragmentation process. © 1990 American Institute of Physics.