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ground state fundamental of HNCO (577 cm'1 234).26 One of the two excited states has a much higher probability of dissociation to NH* + CO than the other. A discussion of the dynamics of the photodissociation of HNCO will be presented in detail in a future publication.25 V. ConclusionsWe have measured the branching ratio [NCO]/[NH] for photodissociation of HNCO at 193 nm and have found that the formation of NH(a'A) dominates that of NCO by about an order of magnitude. The photolysis of HNCO is thus an efficient precursor for NH(a'A). We have also determined the heat of (26) Steiner, D.