PRESSURE DEPENDENCE OF BENZOPHENONE PHOSPHORESCENCE.
CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY
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The phosphorescence spectrum, intensity and lifetime of benzophenone have been studied at 77K as a function of pressure 0-30 kbar in EPA, polymethylmethacrylate PMMA, and polyethylene PE. At 30 kbar the triplet energy is raised 90cm in EPA and lowered about 460cm in PMMA and PE, according to the pressure-induced, reversible shift of the band origin. The triplet lifetime in EPA is reduced from 5.8 to 4.5 msec at 30 kbar pressure. A decrease in phosphorescence intensity suggests that the radiative transition probability diminishes under pressure. The intensity decay becomes strongly nonexponential in polymer matrices under compression. Author
- Radiation and Nuclear Chemistry
- Atomic and Molecular Physics and Spectroscopy