Laser induced dispersed fluorescence spectra of CH3N radical and the lifetime of its أ3E state

The laser induced dispersed fluorescence spectra (LIDFS) of CH3N radical from five different vibronic excited levels were recorded and assigned. The anharmonic constants of the ν″3 (CN stretching) mode were determined to be ω0 = 1049 ± 2 cm−1, ω0ξ0 = 9 ± 0.5 cm−1. The previous tentative assignment of 101 band in the excitation spectrum [J. Chem. Phys. 103 (1995) 4418] was confirmed by LIDFS. The lifetimes of different vibrational levels of the Ã3E state were measured and the radiative lifetimes of ν′ = 0, ν′3 = 1, ν′2 = 1, ν′3 = 2, ν′3 = 3 and ν′1 = 1 states were extrapolated as 415 ± 8, 341 ± 10, 231 ± 18, 219 ± 9, 170 ± 3 and 166 ± 7 ns, respectively.