ELECTRONIC ENERGY OF THE 1La LEVEL OF SUPERSONIC JET-COOLED INDOLE

The dependence of the fluorescence polarization degree on frequency upon excitation into the first and second electronic bands of jet-cooled indole has been studied. A structured band consisting of a number of lines rather than a single line has been recorded in the spectral range of the electronic (1)A'-L-1(a)-transition. The appearance of the lines is interpreted as the result of nonadiabatic vibronic interaction between the electronic L-1(a)-state and vibronicl states of the indole molecule L-1(b)-level. The energy of the unperturbed electronic L-1(a)-level and the orientation of dipole moments near the (1)A'-L-1(a)-transition have been found.