Role Of Torsional Dynamics In The Photophysics Of Xanthene Dyes

Kelly G Casey; Edward L Quitevis

doi:10.1117/12.945453

27 April 1988 Role Of Torsional Dynamics In The Photophysics Of Xanthene Dyes

Kelly G Casey, Edward L Quitevis

Proceedings Volume 0910, Fluorescence Detection II; (1988) https://doi.org/10.1117/12.945453
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

Fluorescence lifetime data for rhodamine B in a series of normal alcohols have been measured as a function of-temperature, solvent polarity, and viscosity. Nonradiative rates for internal conversion have been extracted from this data. The solvent dependence of the nonradiative rates is discussed in terms of two activated barrier crossing models. In one model the activation energy is a linear function of the solvent polarity parameter ET(30). In another mode , the solvent dependence of the nonradiative rate is taken into ''t3- account by a viscosity ependent pre-exponential factor. Consistent results are obtained when a polarity-depend nt activation energy is used.

Citation Download Citation

Kelly G Casey and Edward L Quitevis "Role Of Torsional Dynamics In The Photophysics Of Xanthene Dyes", Proc. SPIE 0910, Fluorescence Detection II, (27 April 1988); https://doi.org/10.1117/12.945453

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