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Proceedings Paper

Excitation energy relaxation in model aggregates of photosynthetic pigments upon picosecond laser excitation
Author(s): Vladimir S. Chirvony; Eduard I. Zenkevich; Roaldas Gadonas; V. Krasauskas; A. Pelakauskas
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Paper Abstract

The methods of picosecond absorption spectroscopy require theuse of sufficiently high laser pulse intensities because of low sensitivity of these methods. The excitation of aggregated systems containing a large number of interacting chromophores, localized in a small volume, by intense laser pulses may lead to side effects which are observed as changes in absorption spectra but are not connected with the processes of electronic excitation energy relaxation. In this paper we present the results of such investigations through the examples of polymer ordered aggregates of photosynthetic pigments (chlorophyll, protochlorophyll, pheophytin) in binary mixtures of water with organic solvent (T=293 K) upon excitation by 20 ps pulses. The observable reversible spectral changes in ps and ns time scales are attributed to the effects of laser heating, rather than to the population of aggregate excited electronic states.

Paper Details

Date Published: 1 May 1991
PDF: 3 pages
Proc. SPIE 1403, Laser Applications in Life Sciences, (1 May 1991); doi: 10.1117/12.57400
Show Author Affiliations
Vladimir S. Chirvony, B. I. Stepanov Institute of Physics (Belarus)
Eduard I. Zenkevich, B. I. Stepanov Institute of Physics (Belarus)
Roaldas Gadonas, Vilnius Univ. (Lithuania)
V. Krasauskas, Vilnius Univ. (Lithuania)
A. Pelakauskas, Vilnius Univ. (Lithuania)

Published in SPIE Proceedings Vol. 1403:
Laser Applications in Life Sciences

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