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 phot olyses of HN3 and DN3 and the 193-nm photolyses of HNCO and DNCO. The vibrational population distributions of the imidogen radicals were inv estigated in each case. The populations from the photolysis of DNCO an d DN3 are reported for the first time. The distributions among the vib rational levels barely exhibit isotope effects. Those obtained for HN3 are at variance with most of the literature values. That for HNCO doe s not agree with a reported result. Evidence from previous investigati ons 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 potent ial surfaces.