RADIATIVE AND RADIATIONLESS PROCESSES IN AROMATIC MOLECULES: PYRENE

The fluorescence yield, triplet yield, and fluorescence lifetime for pyrene-h10 and pyrene-d10 have been measured as a function of temperature. The phosphorescence yield, and phosphorescence lifetime, have also been determined. However, in pyrene-d10 the fluorescence yield increases with increasing...

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Bibliographic Details
Main Authors: Kropp,J. L, Dawson,W. R, Windsor,M. W
Format: Report
Language:English
Subjects:
AROMATIC COMPOUNDS
Atomic and Molecular Physics and Spectroscopy
EFFICIENCY
ELECTRON TRANSITIONS
FLUORESCENCE
INTERSYSTEM CROSSING
LUMINESCENCE
MOLECULAR ENERGY LEVELS
PHOSPHORESCENCE
POLYCYCLIC COMPOUNDS
PYRENES
QUANTUM EFFICIENCY
Radiation and Nuclear Chemistry
RADIATIONLESS DECAY(ELECTROMAGNETIC WAVES)
RELAXATION TIME
SINGLET ENERGY LEVELS
TRIPLET ENERGY LEVELS
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Summary:The fluorescence yield, triplet yield, and fluorescence lifetime for pyrene-h10 and pyrene-d10 have been measured as a function of temperature. The phosphorescence yield, and phosphorescence lifetime, have also been determined. However, in pyrene-d10 the fluorescence yield increases with increasing temperature, indicating that the rate constant for intersystem crossing has a temperature-dependent part. The variation of fluorescence lifetime and triplet yield with temperature for a pyrene-h10 is attributable in toto to a temperature-sensitive internal conversion; in pyrene-d10 both internal conversion and inter-system crossing are temperature-dependent and contribute to the observed variations. (Author)