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8429056 
Journal Article 
Sensitized fluorescence of aromatic hydrocarbons in solution: Spectrophotometric estimation of energy transfer coefficients at high and low optical densities 
Stevens, B; Dubois, JT 
1966 
1 
Transactions of the Faraday Society
ISSN: 0014-7672 
62 
1525-1537 
English 
Conditions have been examined for the measurement of electronic excitation energy transfer coefficients for dissolved aromatic donor+acceptor systems at high and low optical density limits. Transfer coefficients obtained for the phenanthrene+anthracene system at both limits in air-saturated ether are in good agreement with that expected for a diffusion-limited process; the 1La and 1Lb, states of azulene respectively sensitize and quench the 1Lα fluorescent state of anthracene, and naphthalene sensitizes the second excited 1La fluorescent state of azulene. The extremely low self-quenching constants found for naphthalene and phenanthrene are attributed to rapid excimer dissociation under the prevailing conditions; the evidence indicates that this process is also responsible for the low self-quenching constant found for anthracene, and it is suggested that azulene self-quenching involves self-sensitization of the lowest excited (non-fluorescent) 1Lb, state. * Department of Chemistry, Sheffield University, England. † Visiting Research Associate, Wright-Patterson AFB, August-September, 1965. ‡ Aerospace Research Laboratories, Wright-Patterson AFB, Ohio, U.S.A.