Accession Number : AD0698261

Title :   PRESSURE DEPENDENCE OF BENZOPHENONE PHOSPHORESCENCE.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY

Personal Author(s) : Simpson,J. D. ; Offen,H. W.

Report Date : 20 NOV 1969

Pagination or Media Count : 21

Abstract : 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 90/cm in EPA and lowered about 460/cm 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)

Descriptors :   (*BENZOPHENONES, *PHOSPHORESCENCE), HIGH PRESSURE, ORGANIC SOLVENTS, POLYETHYLENE PLASTICS, ACRYLIC RESINS, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE