Accession Number : AD0688928

Title :   FLUORESCENCE LIFETIMES OF PYRENE MONOMER AND EXCIMER AT HIGH PRESSURES.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY

Personal Author(s) : Kim,J. J. ; Beardslee,R. A. ; Phillips,D. T. ; Offen,H. W.

Report Date : 02 JAN 1969

Pagination or Media Count : 7

Abstract : The fluorescence lifetimes of a number of aromatic hydrocarbons are shortened by 15-40% when the matrix is compressed by 30 kbar pressure. The causes of environmentally-induced lifetime shortening may be further illuminated by a detailed study of one solute under a variety of conditions. The document reports on such a study of pyrene and in addition, compares the pressure-enhanced electronic relaxation for the monomeric and excimeric forms of pyrene. The work established the magnitude of environmental influences on the singlet lifetime of pyrene and demonstrated a remarkable insensitivity of the emitting species to the nature of the microscopic surroundings, be it monomer or excimer.

Descriptors :   (*POLYCYCLIC COMPOUNDS, *FLUORESCENCE), MOLECULAR ISOMERISM, RELAXATION TIME, HIGH PRESSURE

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE