Accession Number : AD0281776

Title :   THE TRIPLET STATE.

Descriptive Note : Final technical rept.,

Corporate Author : SHEFFIELD UNIV (ENGLAND)

Personal Author(s) : Porter,George

Report Date : 30 MAR 1962

Pagination or Media Count : 20

Abstract : The first order decay of triplet states of naphthalene, anthracene, phenanthrene and their halogenated derivatives was studied in cyclo-hexane and viscous paraffin solutions. The decay results partly from a bimolecular quenching process and partly from a true first order radiationless conversion to the ground state. The rate of the quenching process is a function of the solvent and, in anthracene derivatives, of the extent to which the solutions have been irradiated. The rates of radiationless conversion can only be measured when they exceed the rates of quenching processes. Bromination of anthracene is 10 times more effective in enhancing conversion than chlorination at the same position and halogenation at the 9, 10 positions has four times the effect of halogenation at other positions. (Author)

Descriptors :   *ANTHRACENES, *NAPHTHALENES, *NUCLEAR ENERGY LEVELS, *PHENANTHRENES, *PHOTOCHEMICAL REACTIONS, ATOMIC ENERGY LEVELS, BROMIDES, CYCLOHEXANES, DECOMPOSITION, ELECTRON TRANSITIONS, HALIDES, MOLECULAR STRUCTURE, ORGANIC SOLVENTS, PHOSPHORESCENCE, PHOTOELECTRIC EFFECT, RADIOACTIVE DECAY, SPECTROGRAPHIC ANALYSIS, ULTRAVIOLET SPECTROSCOPY

Distribution Statement : APPROVED FOR PUBLIC RELEASE