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Proceedings Paper

Coherent nuclear motion and exciton state dynamics in photosynthetic light-harvesting pigment proteins
Author(s): Toenu Pullertis; M. Chachisvilis; I. I. Fedchenia; M. R. Jones; C. N. Hunter; Sven Larsson; Villy Sundstrom
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Paper Abstract

We have used approximately 40 fs pulses from a Ti:sapphire laser to investigate the ultrafast energy transfer and relaxation dynamics in the light-harvesting pigment-proteins of photosynthetic purple bacteria. Our results reveal two new features, not earlier observed in light-harvesting pigments: (1) ultrafast relaxation characterized by a time constant of approximately 20 fs, which we interpret as interexciton state relaxation; (2) coherent nuclear motions. These new results are challenging the applicability of the `standard' Forster theory to the excitation transfer in photosynthetic antennae which motivated us to examine a more detailed description of the dynamics.

Paper Details

Date Published: 2 January 1995
PDF: 11 pages
Proc. SPIE 2370, 5th International Conference on Laser Applications in Life Sciences, (2 January 1995); doi: 10.1117/12.197447
Show Author Affiliations
Toenu Pullertis, Univ. of Umea (Sweden)
M. Chachisvilis, Univ. of Umea (Sweden)
I. I. Fedchenia, Univ. of Umea (Sweden)
M. R. Jones, Univ. of Sheffield (United Kingdom)
C. N. Hunter, Univ. of Sheffield (United Kingdom)
Sven Larsson, Chalmers Technical Univ. (Sweden)
Villy Sundstrom, Univ. of Umea (Sweden)

Published in SPIE Proceedings Vol. 2370:
5th International Conference on Laser Applications in Life Sciences
Pavel A. Apanasevich; Nikolai I. Koroteev; Sergei G. Kruglik; Victor N. Zadkov, Editor(s)

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