RADIATIVE AND RADIATIONLESS PROCESSES IN AROMATIC MOLECULES: PYRENE.

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Abstract:

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

Author(s):
Kropp, J. L. ; Dawson, W. R. ; Windsor, M. W.
Author Organization(s):
TRW SYSTEMS REDONDO BEACH CALIF CHEMICAL SCIENCES DEPT
Descriptive Note:
Technical rept.,
Pagination:
0020

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-8, 07126-6006-R0-00
Contract/Grant Number(s):
N00014-67-C-0327
Project Number(s):
NR-051-488
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*POLYCYCLIC COMPOUNDS, *LUMINESCENCE), FLUORESCENCE, PHOSPHORESCENCE, EFFICIENCY, MOLECULAR ENERGY LEVELS, ELECTRON TRANSITIONS, RELAXATION TIME, AROMATIC COMPOUNDS
Field(s)/Group(s):
Radiation and Nuclear Chemistry, Atomic and Molecular Physics and Spectroscopy
Keyword(s):
INTERSYSTEM CROSSING, *PYRENES, QUANTUM EFFICIENCY, RADIATIONLESS DECAY(ELECTROMAGNETIC WAVES), SINGLET ENERGY LEVELS, TRIPLET ENERGY LEVELS
Report Date:
1968 Oct 30