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We have determined the extent of residual inhomogeneous broadening in the "sharp" mixed-crystal spectrum of the large organic molecule pentacene; and we report a technique for the direct fluorescence measurement of excited-vibrational-state bandwidths. We have found the lifetime of the 267-cm^-1 vibronic band in pentacene to be greater than 0.2 nsec.
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Marchetti et al. (1975) studied this question.
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