Na. Borisevich et al., Experimental measurement and calculation of the line intensities in vibronic spectra of jet-cooled anthracene, OPT SPECTRO, 89(2), 2000, pp. 225-231
The intensities of vibronic lines are experimentally measured in fluorescen
ce and fluorescence excitation spectra of jet-cooled anthracene. An origina
l method is developed for calculating geometrical parameters of benzene hyd
rocarbons in the ground and excited electronic states. Using these paramete
rs, the intensities of vibronic lines in fluorescence and absorption spectr
a of anthracene are calculated in the Franck-Condon approximation taking in
to account the mixing of all the twelve normal coordinates of totally symme
tric vibrational modes. After correction for the quantum yield of fluoresce
nce, good agreement is obtained between the calculated line intensities in
the absorption spectrum and the measured line intensities in the fluorescen
ce excitation spectrum. Based on these data, a new assignment of the lines
in the fluorescence excitation spectrum corresponding to totally symmetric
modes 7 and 8 is suggested. (C) 2000 MAIK "Nauka/Interperiodica".