Radiative and nonradiative transition probabilities for the 1B2 state of aniline in the low pressure vapor phase

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Abstract
Fluorescence decay studies are described for the 1B2 state of aniline excited to several approximately single vibronic levels in the collision‐free vapor phase. The decay is found to be strictly a single exponential for both 0.8 and 2.0 Å bandwidth excitation into either the strong bands or into some of the valleys between strong bands. The radiative transition probability is independent of excitation energy for states corresponding to the intense absorption bands, up to an excess energy of about 2000 cm−1. The nonradiative transition probability increases slowly with energy in a manner analogous to that observed for benzene. Environmental effects on the radiative and nonradiative transition probabilities are also discussed.