
%0 Journal Article
%A Knight, AEW 
%A Selinger, BK 
%A Ross, IG 
%T Fluorescence decay of aromatic vapours. II. Single vibronic level lifetimes of the isolated naphthalene molecule
%J Australian Journal of Chemistry
%D 1973/06/01
%V 26
%N 6
%P 1159-1172
%K 
%R https://doi.org/10.1071/CH9731159
%U https://www.publish.csiro.au/paper/CH9731159 
%X The lifetimes of single vibronic levels of naphthalene-h8 and ?d8 have been studied under collision-free conditions in the vapour. The lifetime of the vibration less 1B3u state of naphthalene-d8 was found to be 485±5 ns. At sufficiently high resolution of the exciting light the fluorescence decay is exponential. The mean fluorescence lifetime of the prepared state decreases with increasing vibrational energy content but not as a smooth function of energy. The ratio of lifetimes for the 0° and 8(b18)1 states is explicable entirely in terms of the differing radiative pathways for electronic relaxation. The quantum yields for these states of naphthalene-h8 are estimated to be of the order of 0.45 and 0.63 for the 0° and 8(b18)1 state respectively.     The lifetimes of comparable states show a normal deuterium isotope effect; for higher energies where the errors are larger the evidence is less certain. 
