PICOSECOND ABSORPTION STUDIES OF Zn-OCTAETHYLPORPHIN π-MONOANIONS |
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| Authors: | Vladimir S. Chirvony Gennady N. Sinyakov Roaldas Gadonas Vytautas Krasauskas Algimantas Pelakauskas |
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| Affiliation: | B.I. Stepanov Institute of Physics, BSSR Academy of Sciences, Leninsky prospekt 70, 220602 Minsk, USSR;Laser Research Center, Vilnius University. Vilnius, USSR |
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| Abstract: | Abstract— Using the example of Zn-octaethylporphin π-monoanion solution in tetrahydrofuran, we studied the dynamics of ultrafast photoprocesses in porphyrin π-anions using a tunable picosecond absorption spectrometer. The deactivation kinetics of the lowest excited electronic (doublet) state of Zn-octaethylporphin iT-monoanion has been determined and was found to be followed by a single exponential function with the characteristic time 135 ps. It is shown that upon picosecond excitation to the long wavelength absorption band (λmax= 830 nm) the process of two-quantum photoionization of the involved monoanion is easily realized, with the results that the observable kinetics of spectral changes exhibit a strong dependence on the excitation intensity. |
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