Role of torsional dynamics in the photophysics of xanthene dyes

Kelly G. Casey, Edward L. Quitevis

Research output: Contribution to journalArticle

5 Scopus citations

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.

Original languageEnglish
Pages (from-to)144-150
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume910
DOIs
StatePublished - Apr 27 1988

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