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Updated: Jun 29, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
Published on: July 19, 2019
Electronic and vibrational relaxation of porphycene in solution
Piotr Fita1, Czesław Radzewicz, Jacek Waluk
1Institute of Experimental Physics, University of Warsaw, Hoza 69, 00-681 Warsaw, Poland. fita@fuw.edu.pl
Abstract:
The relaxation of electronically excited porphycene in acetonitrile solution has been studied by transient absorption spectroscopy supported by global analysis techniques. Three processes following the femtosecond pulse excitation to the S 2 state have been identified: the intramolecular vibrational redistribution on the time scale of tens of femtoseconds, the internal conversion S 2 right arrow-wavy S 1 (750 fs) and thermal equilibration of the molecule by energy exchange with the solvent (16 ps). The recorded transient absorption kinetics exhibit oscillations which have been assigned to the evolution of wavepackets in both S 1 and S 0 states.
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