Accession Number : AD0707280

Title :   QUENCHING OF BENZENE FLUORESCENCE BY OXYGEN,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF CHEMISTRY

Personal Author(s) : Morikawa,A. ; Cvetanovic,R. J.

Report Date : 11 AUG 1969

Pagination or Media Count : 3

Abstract : Molecular oxygen has been found to quench benzene fluorescence without noticeably decreasing the concentration of the benzene triplet (Triplet B(1u)) although the fluorescing species, the excited singlet (singlet B(2u)) is the precursor of the triplet. The most obvious explanation of this apparent anomaly is that the (singlet B(2u)) state is converted to the triplet (triplet B(1u)) when it is quenched by O2, perhaps with simultaneous conversion of O2 to the first excited singlet (singlet Delta (g)). The estimated values of the quenching rate constants of benzene singlet and benzene triplet by oxygen were found. (Author)

Descriptors :   (*BENZENE, *FLUORESCENCE), QUENCHING(INHIBITION), OXYGEN, MOLECULAR ENERGY LEVELS, CANADA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE