Abstract

We present a direct observation of an ultrafast time-resolved emission spectrum of a dye molecule in solution, the time resolution of the system being 2 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}12}$ sec. Vibrational relaxation within the vibrational manifold of the excited electronic state of rhodamine 6G occurs within 6 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}12}$ sec. We discuss the implications of these results for the understanding of homogeneous broadening of excited electronic states of large molecules.

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