Analysis of fluorescence line shapes and Raman excitation profiles of tetradesmethyl-β-carotene

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Abstract
The fluorescence lineshapes and Raman excitation profiles of tetradesmethyl-β-carotene in isopentane at 190 and 230 K are analyzed and related to the solvation dynamics and vibrational relaxation. We find a solvation time scale of 125 fs at 190 K, 111 fs at 230 K, and a vibrational relaxation time scale of 253 fs at both temperatures. The magnitude of the fluctuations of the electronic energy gap due to interactions with the solvent and with molecular low frequency modes is 423 cm−1 at 190 K and 480 cm−1 at 230 K.