Abstract
Abstract Three bands of the flash-photolysis absorption spectrum of benzyl in the visible are rotationally analyzed: a type- B band, 6 a 0 1 , at 4456 A, and two type- A bands, A 1 and A 2 , at 4477 and 4465 A, respectively. The band notation is taken from the vibronic analysis of that region of the benzyl electronic spectrum by C. Cossart-Magos and S. Leach. The observed rotational contours were fitted by computer-simulated rotational contours, resulting in the determination of the variations, Δ A , Δ B , and Δ C of the rotational constants accompanying the vibronic transitions corresponding to each band. Different A ′, B ′, and C ′ values are obtained for the three upper levels and are discussed in light of the previous vibronic assignments. The application of the present results to the study of low-temperature rotational band contours in supercooled benzyl spectra is also discussed.
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