ENERGY REDISTRIBUTION IN "ISOLATED" VIBRATIONAL MODES OF PARA ALKYLSUBSTITUTED ANILINES
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Date
1980
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Ohio State University
Abstract
To characterize vibrational energy relaxation, this $^{1}B_{2}(\pi, \pi^{*})\leftarrow ^{1}A_{1}$ transition of the p-alkylaniline series has been studied in a supersonic free jet. The two quanta $NH_{2}$ inversion mode in these molecules is expected to be weakly coupled to the low frequency torsion and bends of the para-subtituted alkyl chain. The absorption spectra of the series aniline through p-butylaniline show that the inversion mode is largely unaffected by the length of the alkyl chain. Even for such weakly coupled modes, the fluorescence spectra from the $^{1}B_{2}$ state shows vibrational relaxation occurring into the chain modes within a nanosecond.
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