Accession Number : AD0682245

Title :   RADIATIVE AND RADIATIONLESS PROCESSES IN AROMATIC MOLECULES: PYRENE.

Descriptive Note : Technical rept.,

Corporate Author : TRW SYSTEMS REDONDO BEACH CALIF CHEMICAL SCIENCES DEPT

Personal Author(s) : Kropp,J. L. ; Dawson,W. R. ; Windsor,M. W.

Report Date : 30 OCT 1968

Pagination or Media Count : 20

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)

Descriptors :   (*POLYCYCLIC COMPOUNDS, *LUMINESCENCE), FLUORESCENCE, PHOSPHORESCENCE, EFFICIENCY, MOLECULAR ENERGY LEVELS, ELECTRON TRANSITIONS, RELAXATION TIME, AROMATIC COMPOUNDS

Subject Categories : Radiation and Nuclear Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE