Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (07): 636-642.doi: 10.3866/PKU.WHXB19990711

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Ultrafast Internal Conversion and Vibrational Relaxation of Butylphthalocyanine and Tetraphenylporphyrin in Solution

He Yong, Xiong Yi-Jia, Zhu Qi-He, Kong Fan-Ao   

  1. State Key Laboratory of Molecular Reaction Dynamics,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080
  • Received:1998-11-17 Revised:1999-02-04 Published:1999-07-15
  • Contact: Kong Fan-Ao

Abstract:

Ultrafast internal conversion (IC) and vibrational relaxation dynamics of electronically excited butylphthalocyanine (BuPc ) and tetra-phenylporpyrin (TPP ) molecules in solution are theoretically studied on the basis of the perturbative density operaor method and the transient linear susceptibility theory. Femtosecond time-resolved profile of fluorescence depetion is simulated with a single vibrational mode. The internal conversion, the vibrational relaxation and the solvation rate constants in electronically excited states are determined. The results show that the sharp peak of fluorescence depletion reflects primarily the internal conversion process from the S2 state to the S1 state of BuPc and TPP.IC occurs in a 200 fs time scale.

Key words: Femtosecond fluorescence depldtion spectra, Ultrafast internal conversion, Vibrational relxation