HIGH RESOLUTION SINGLET-TRIPLET ABSORPTION SPECTRA OBTAINED BY PHOTOEXCITATION TECHNIQUES.
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Date
1967
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Ohio State University
Abstract
The $T_{t}\leftarrow S_{0}$ absorption spectra of single crystals of naphthalene doped with a phosphorescent impurity have been obtained using photoexcitation techniques. The resolution is sufficiently high to clearly reveal the Davydov splitting of the vibronic bands. The photoexcitation spectrum of a single crystal 4 mm long shows more than 15 vibronic bands with a signal to noise ratio of the strongest band (the 0.0) of about 40 to 1. This is to be compared to the direct absorption of a crystal 40 mm long which only reveals 5 vibronic bands with a signal-to-noise ratio of approximately 4 to 1 for the $0,0$.
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Author Institution: Gates and Crellin Laboratories of Chemistry, California Institute of Technology