Two-photon dissociation of N2O to produce N(2D) and N(2P)

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Hironobu Umemoto, Manabu Kashiwazaki and Tomonari Yahata


Abstract

N2O was two-photon photolyzed between 235 and 240 nm. N(2D), N(2P) and NO(v″=1) could be detected as products by a resonance-enhanced multi-photon ionization technique combined with a time-of-flight mass spectrometric technique. The Doppler profile measurements of N(2D) and N(2P) showed that these species are formed in the two-photon dissociation of N2O. Dissociation of the three-photon super excited states can be ignored. The yields of N(2D), N(2P) and NO(v″=1) as well as that of parent N2O+ ions were measured as a function of the wavenumber of the excitation laser. Vibrational structures attributable to the 3pσ1Π–X 1Σ+ transition could be observed. Excitation to the 201+) state was found to promote the dissociation to neutral species. This suggests that the predissociation proceeds via a dissociative A′ state in the Cs symmetry.


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