dc.creator El-Bayoumi, M. Ashraf en_US dc.creator Dalle, Jean-Paul en_US dc.creator O'Dwyer, M. F. en_US dc.date.accessioned 2006-06-15T16:53:54Z dc.date.available 2006-06-15T16:53:54Z dc.date.issued 1969 en_US dc.identifier 1969-Sigma-12 en_US dc.identifier.uri http://hdl.handle.net/1811/15840 dc.description Author Institution: Biophysics Department, Michigan State University en_US dc.description.abstract Large configuration change in the excited state of a molecular system can be an important factor in causing large discrepancies between observed radiative lifetimes and lifetimes calculated from the corresponding integrated absorption intensity. We have measured fluorescence lifetimes and quantum yields in different solvents for a number of molecules. Our results indicate that $r_{o}$, the radiative fluorescence lifetime, increases with an increase of the polarity of the solvent. At low temperatures, when the solvent cage reorientation cannot occur during the lifetime of the excited state, the emission arises from a Franck-Condon state which has an equilibrium configuration similar to that of the ground state. Under these conditions $\tau_{o}$ decreases and the emission becomes blue shifted. en_US dc.format.extent 209928 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title RADIATIVE LIFETIMES IN MOLECULAR SYSTEMS WHICH UNDERGO LARGE CONFIGURATION CHANGE IN THE EXCITED STATE. en_US dc.type article en_US
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