Reinvestigation of vibronic level dependence of fluorescence quantum yields and radiative and nonradiative lifetimes of p-difluorobenzene in its first excited singlet state (/sup 1/B/sub 2//sub u/)

Journal Article · Fri Jul 01 04:00:00 EDT 1977 · J. Chem. Phys.; (United States)

OSTI ID:7098552

Volk, L J; Lee, E K.C.

The fluorescence quantum yields (Phi/sub f/) of p-C/sub 6/H/sub 4/F/sub 2/ (/sup 1/B/sub 2//sub u/) have been measured for a number of vibronic levels at low pressures where ''isolated'' molecule condition can be maintained. Our present values obtained by continuous excitation are significantly different than those obtained previously by flash excitation (C. Guttman and S. A. Rice, J. Chem. Phys. 61, 661 (1974)); we obtain 0.70 vs the previous value of 1.00 for the fluorescence quantum yield of the 0--0 band. On the basis of the new value of Phi/sub f/, a set of revised values of radiative lifetimes (tau/sub r/) and nonradiative lifetimes (tau/sub n r/) of various vibronic levels are obtained.

• Research Organization: Department of Chemistry, University of California, Irvine, California 92717
• OSTI ID: 7098552
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 67:1; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AROMATICS
CHEMISTRY
ELECTRONIC STRUCTURE
ENERGY LEVELS
EXCITED STATES
FLUORESCENCE
FLUORINATED AROMATIC HYDROCARBONS
HALOGENATED AROMATIC HYDROCARBONS
LIFETIME
LUMINESCENCE
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMISTRY
VIBRATIONAL STATES