Excitation energy relaxation in model aggregates of photosynthetic pigments upon picosecond laser excitation

Vladimir S. Chirvony; Eduard I. Zenkevich; Roaldas Gadonas; V. Krasauskas; A. Pelakauskas

doi:10.1117/12.57400

1 May 1991 Excitation energy relaxation in model aggregates of photosynthetic pigments upon picosecond laser excitation

Vladimir S. Chirvony, Eduard I. Zenkevich, Roaldas Gadonas, V. Krasauskas, A. Pelakauskas

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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available