Two-photon excitation of nitrogen oxide at photofragmentation of nitrobenzene
Puchikin A. V. 1, Panchenko Yu. N. 1,2, Andreev M. V. 2, Konovalov I. N. 1, Prokopiev V. E. 2
1Institute of High Current Electronics, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia
2Tomsk State University, Tomsk, Russia
Email: apuchikin@mail.ru, yu.n.panchenko@mail.ru, andreevmv_86@mail.ru, ivan@lgl.hcei.tsc.ru, prokop@ogl.hcei.tsc.ru

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The results of a study of the temporal and spectral characteristics of the fluorescence of nitric oxide NO A2Σ obtained under dual-frequency laser action with nitrobenzene C6H5NO2 are presented. The physical mechanism for the appearance of fluorescence from the electronic level of NO A2Σ, v'(0), caused by two-photon excitation of the electronic transition NO A2Σ-X2, v'v'' (0,1) by laser radiation (472 nm) of femtosecond duration, is shown. In this case, vibrationally excited NO X2, v''(1) molecules appear as photofragments of nitrobenzene after interaction with laser radiation of a KrF-laser (248.3 nm) of nanosecond duration. It is noted that registration of the fluorescent signal for this experimental setup is observed at a femtosecond pulse intensity of ~300 GW/cm2. Keywords: photofragmentation, two-photon absorption, nitro compound, fluorescence.
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