PHOSPHORESCENCE SPECTRUM AND TRIPLET STATE LIFETIME OF PURE CRYSTALLINE NAPHTHALENE
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Date
1968
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Ohio State University
Abstract
The phosphorescence spectrum of pure crystalline naphthalene has been observed both at room temperature and $77^{\circ} K$. The spectrum consists of the 0.0 transition at $4715 {\AA}$ and several intense vibronic bands that correlate well with the most intense vibronic transitions observed in isotopic mixed crystal phosphorescence spectra at $4.2^{\circ} K$. The width of the 0,0 band at half intensity decreases from $270 cm^{-1}$ at room temperature to about $75 cm^{-1}$ at $77^{\circ} K$, indicating the presence of exciton-phonon interactions in the crystal. Similar narrowing of the vibronic bands is also observed. The triplet state lifetime determined from the decay of the phosphorescence is 130 msec $\pm 15%$. Impurities appear to have a significant influence on the triplet exciton behavior even at the relatively high temperatures at which the experiments were carried out.
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Author Institution: Laboratory of Chemical Physics, California Institute of Technology; Michigan State University/Atomic Energy Commission, Plant Research Laboratory