Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science

Fluorescence decay of aromatic vapours. II. Single vibronic level lifetimes of the isolated naphthalene molecule

AEW Knight, BK Selinger and IG Ross

Australian Journal of Chemistry 26(6) 1159 - 1172
Published: 1973


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.

© CSIRO 1973

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