FLUORESCENCE LIFETIMES OF PYRENE MONOMER AND EXCIMER AT HIGH PRESSURES.
CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY
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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.
- Radiation and Nuclear Chemistry