Excitation relaxation of zinc and free-base porphyrin probed by femtosecond fluorescence spectroscopy

Fluorescence rise and decay times of zinc porphyrin (ZnP) and free-base porphyrin (H 2P) were measured using a fluorescence up-conversion method. The observed fluorescence signals were analyzed to be a sum of three exponentials: 150 fs, 600 fs, and 1.5 ns for ZnP; and 90 fs, 1.5 ps, and 12 ns for H...

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Bibliographic Details
Published in:Chemical physics letters 1999-08, Vol.309 (3), p.177-182
Main Authors: Akimoto, Seiji, Yamazaki, Tomoko, Yamazaki, Iwao, Osuka, Atsuhiro
Format: Article
Language:English
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Summary:Fluorescence rise and decay times of zinc porphyrin (ZnP) and free-base porphyrin (H 2P) were measured using a fluorescence up-conversion method. The observed fluorescence signals were analyzed to be a sum of three exponentials: 150 fs, 600 fs, and 1.5 ns for ZnP; and 90 fs, 1.5 ps, and 12 ns for H 2P. The two fastest components of 150 and 600 fs for ZnP are associated with the decay processes of B→Q internal conversion and the vibrational relaxation in the Q state, respectively. The short-lived components of 90 fs and 1.5 ps for H 2P are correlated with the decay processes of Q y →Q x internal conversion and the vibrational relaxation in the Q x state, respectively.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(99)00688-0