| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9582429 | Chemical Physics Letters | 2005 | 6 Pages |
Abstract
We present an experimental investigation on the photophysical properties of meso-tetra(sulfonatophenyl) porphyrin (TPPS4) in its bi-protonated and deprotonated states in water solutions at pH 4.0 and 7.0, respectively. The Z-scan technique at 532Â nm with single 70Â ps pulses as well as with pulse trains, was used in association with other complementary techniques such as UV-Vis absorption spectroscopy and time resolved fluorescence. The saturation behavior and the time evolution of nonlinear optical absorption were analyzed with a five-energy-level diagram. Photophysical parameters such as ground and excited states absorption cross-sections, together with the fluorescence lifetime and intersystem crossing time were determined.
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Authors
P.J. Gonçalves, L. De Boni, N.M. Barbosa Neto, J.J. Jr., S.C. ZÃlio, I.E. Borissevitch,