Accession Number : AD0675201

Title :   TEMPERATURE EFFECTS ON THE PHOSPHORESCENCE OF BENZOPHENONE,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Jones,Peter F. ; Siegel,Seymour

Report Date : JUL 1968

Pagination or Media Count : 13

Abstract : The paper reports the first observation of the phosphorescence of benzophenone in 'solution' at 298K. By using poly(methyl methacrylate) as a rigid solvent matrix, it was possible to minimize diffusion-limited quenching processes that may be responsible for the short lifetimes previously observed in benzene. The temperature dependence of the phosphorescence intensity and lifetime were also measured which permits an evaluation of temperature effects on the rate constants for both radiative kr and nonradiative knr decay of the triplet state. It was found that at 80K knr = 50/sec and kr = 150/sec, while at 298K knr = 530/sec and kr = 44/sec. (Author)

Descriptors :   (*BENZOPHENONES, *PHOSPHORESCENCE), SOLID SOLUTIONS, ACRYLIC RESINS, TEMPERATURE, INTENSITY, RELAXATION TIME, MOLECULAR ENERGY LEVELS

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE