Spectroscopic studies on napththalene in the vapor phase. III. Phosphorescence and intersystem crossing yields of single vibronic levels

Gas-phase phosphorescence spectra of naphthalene-h8 and -d8 are reported. A triplet lifetime of 4.2 msec was derived from the 000 band of the n-h8 phosphorescence. Intersystem crossing yields of single vibronic levels in S1 were determined from excitation spectra of biacetyl phosphorescence.