Time-Resolved, Dispersed Laser-Induced Fluorescence of NO2: Observation of Collision-Induced Energy Transfer Effect

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Abstract
The time-resolved fluorescence spectrum of NO2 excited at 463.0 nm was investigated using an Nd: YAG laser-pumped tunable dye laser, and the energy transfer effect was clearly observed in the decay curves of band and continuum fluorescences. The two rate constants, 5.3×107 Torr-1 sec-1 and 1.8×107 Torr-1 sec-1, and the quenching rate constant, 3.8×106 Torr-1 sec-1, were determined from the pressure-dependence of the lifetimes. This value of the fast rate constant is 2.5 times larger than previously reported ones. Also, the present measurement indicates the upper level excited at 463.0 nm has the 2B2 character, and the radiative lifetime, obtained from extrapolation to zero pressure, is 30 µsec.