The 532 nm multiphoton dissociation of NO2has been investigated, following the work of Matsumietal. lsqb;Laser Chem.1, 113 (1983)rsqb;, which demonstrated that highly vibrationally excited O2(vle;25) is a product. We have shown that O2(v) is generated in a secondary reaction, possibly through the interaction between primary O(1S) and the parent molecule. Competitive quenching experiments with N2indicate that O(1D) is not involved in O2(v=24) production. Primary NO(v) has been detected by onehyphen; and twohyphen;photon excitation, withvle;7. Its source is probably 532 nm twohyphen;photon dissociation of NO2. The generation of O(1S) requires absorption of four 532 nm photons by NO2.
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