NH ND(A1-DELTA,UPSILON'') VIBRATIONAL DISTRIBUTIONS IN THE UV PHOTOLYSES OF HN3/DN3 AND HNCO DNCO

NH/ND(a1DELTA,v'') radicals were generated in the 248- and 193-nm photolyses of HN3 and DN3 and the 193-nm photolyses of HNCO and DNCO. The vibrational population distributions of the imidogen radicals were investigated in each case. The populations from the photolysis of DNCO and DN3 are reported for the first time. The distributions among the vibrational levels barely exhibit isotope effects. Those obtained for HN3 are at variance with most of the literature values. That for HNCO does not agree with a reported result. Evidence from previous investigations of the products of relaxation and electronic quenching of NH(a,v'') is offered in support of our results. The vibrational distributions are consistent with dissociation processes on steeply repulsive potential surfaces.