Accession Number : AD0664091

Title :   RELATIVE INTERACTION RADII FOR QUENCHING OF TRIPLET STATE MOLECULES,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LABS DIV

Personal Author(s) : Siegel,Seymour ; Judeikis,Henry S.

Report Date : SEP 1967

Pagination or Media Count : 31

Abstract : The relative efficiencies with which O2, NO, and Xe enhance the transition from the excited triplet state to the ground state in naphthalene have been determined from static experiments. Essentially the experiments consisted of the observation of the steady state phosphorescent emission intensity and the intensity of the electron spin resonance (ESR) signal of the triplet state molecules as functions of added quencher. All measurements were made in 3-methylpentane (3-MeP) glass solutions at 77K, where material diffusion is minimized. The derived results are discussed in terms of triplet state quenching by energy transfer to the quencher and by the enhancement of intramolecular triplet-singlet intersystem crossing. Since NO does not have the necessary energy levels for energy transfer from naphthalene to proceed, the result that the value for the effective interaction distance for the quenching process for NO is larger than that for O2 indicates that energy transfer probably does not occur in the O2 case either.

Descriptors :   (*NAPHTHALENES, *MOLECULAR ENERGY LEVELS), (*PHOSPHORESCENCE, QUENCHING(INHIBITION)), OXYGEN, NITROGEN OXIDES, XENON, ELECTRON TRANSITIONS, EMISSIVITY, INTENSITY, ELECTRON PARAMAGNETIC RESONANCE, INTERACTIONS

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE