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dc.creatorWatson, P.en_US
dc.creatorEl-Bayoumi, M. Ashrafen_US
dc.date.accessioned2006-06-15T13:20:35Z
dc.date.available2006-06-15T13:20:35Z
dc.date.issued1970en_US
dc.identifier1970-P-2en_US
dc.identifier.urihttp://hdl.handle.net/1811/8497
dc.descriptionAuthor Institution: Biophysics Department, Michigan State Universityen_US
dc.description.abstractThe lowest singlet-singlet absorption in phenyl-substituted methanes becomes progressively stronger as the number of phenyl groups is increased. One would thus expect fluorescence to compete progressively more favorably with phosphorescence. However, it has been shown that $\phi_{p}/\phi p$ increases as the number of phenyl groups in the series is increased. Because of the near constancy in the measured phosphorescence lifetimes ($\tau_{p}$) the phosphorescence enhancement was explained in terms of an exciton splitting mechanism. We have estimated the quantum yield of triplet population ($\phi_{t}$) from fluorescence quantum yields ($\phi_{p}$) using the relation $\phi_{t}\sim(1-\phi_{p})$. The fluorescent quantum yields are nearly constant throughout the series. Therefore, the radiative phosphorescence lifetimes $\tau_{p}=(\phi_{t}/\phi_{p})\tau_{p}$ decrease with increasing molecular size. This seems more consistent with a spin orbit enhancement mechanism.en_US
dc.format.extent80124 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleINTERSYSTEM CROSSING ENHANCEMENT IN PHENYL SUBSTITUTED METHANESen_US
dc.typearticleen_US


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