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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Published in | Chemical physics letters Vol. 309; no. 3; pp. 177 - 182 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
13.08.1999
|
Online Access | Get full text |
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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. |
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ISSN: | 0009-2614 1873-4448 |
DOI: | 10.1016/S0009-2614(99)00688-0 |