SPECTROSCOPIC STUDIES ON TOLUENE AND SOME DEUTERATED DERIVATIVES .2. ELECTRONIC-SPECTRA

The 266.7 nm absorption systems of toluene and seven deuterated isomer s were observed at high resolution and analyses of their vibronic stru cture performed. All in-plane vibrations with ground-state frequencies less than 1000 cm(-1) were identified from 0-1 hot bands. The frequen cies agree well with data obtained from infrared and Raman studies. Th e corresponding vibrations were identified in the excited state. Infor mation was also obtained on out-of-plane vibrations with ground-state frequencies less than 650 cm(-1), since all of these are found to give sequence structure. A comparison of the measured data for the various isotopic species has enabled a consistent description of the excited state in toluene to be made. Problems associated with errors, ambiguit ies, and inconsistencies in previously published work have been addres sed.