Resonance-state selective photodissociation of OCS (2 1 Σ + ): Rotational and vibrational distributions of CO fragmentsThe nascent vibrational state distribution of NH(X 3 ⌺ Ϫ ) radicals produced in the reaction of N( 2 D) with H 2 was determined by employing a pulsed laser technique. N( 2 D) was produced by two-photon dissociation of NO, while NH(X 3 ⌺ Ϫ ) was detected by laser-induced fluorescence. Off-diagonal transitions of the A -X system were employed to probe NH(X 3 ⌺ Ϫ ,vЉу2) because of the predissociative nature of the upper state. The vibrational distribution was determined to be 10.0(vЉϭ0): 8.0Ϯ1.0(vЉϭ1): 5.0Ϯ0.7(vЉϭ2): 2.5Ϯ0.5(vЉϭ3). This distribution is much cooler than that obtained by infrared emission measurements, but is similar to that of recent quasiclassical trajectory calculations as well as that of three dimensional quantum calculations based on an ab initio potential energy surface. The agreement with theoretical results suggests that the reaction proceeds via an insertive process.
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