Abstract

Biphenylene in various solvents is investigated by picosecond time-resolved absorption spectroscopy. The time dependence of the spectral shape of the vibrationally hot S n ←S 1 absorption was analyzed by using the Urbach relation. Vibrational energy flow to the solvent molecules in the surroundings from the higher vibrational state of S 1 was proportional to the excess vibrational energy.

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