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1 May 1991 Excitation energy relaxation in model aggregates of photosynthetic pigments upon picosecond laser excitation
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Proceedings Volume 1403, Laser Applications in Life Sciences; (1991) https://doi.org/10.1117/12.57400
Event: Laser Applications in Life Sciences, 1990, Moscow, Russian Federation
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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vladimir S. Chirvony, Eduard I. Zenkevich, Roaldas Gadonas, V. Krasauskas, and A. Pelakauskas "Excitation energy relaxation in model aggregates of photosynthetic pigments upon picosecond laser excitation", Proc. SPIE 1403, Laser Applications in Life Sciences, (1 May 1991); https://doi.org/10.1117/12.57400
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