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Elementary excitation in photosynthetic purple bacteria : How big is it?

Chachisvilis, M. LU ; Pullerits, T. LU ; Westerhuis, W. ; Hunter, C. N. and Sundström, V. LU (1996) In Springer Series in Chemical Physics 62. p.314-315
Abstract

We have studied excitation energy transfer in the photosynthetic antenna
systems LH1 and LH2 of purple bacteria. Femtosecond pump-probe
experiments were combined with computer simulations using the recently
established structure of these systems to assess the nature of
electronic excitation. We have measured the transient absorption
kinetics and spectra of the LH1 and LH2 complexes in the temperature
range from 4.2 K to 296 K with femtosecond time resolution. The Pauli
master equation approach suggests that experimentally measured
population and anisotropy kinetics in LH1 and LH2 cannot be described as
a simple hopping between bacteriochlorophyll (BChl) a molecules.
Exciton... (More)

We have studied excitation energy transfer in the photosynthetic antenna
systems LH1 and LH2 of purple bacteria. Femtosecond pump-probe
experiments were combined with computer simulations using the recently
established structure of these systems to assess the nature of
electronic excitation. We have measured the transient absorption
kinetics and spectra of the LH1 and LH2 complexes in the temperature
range from 4.2 K to 296 K with femtosecond time resolution. The Pauli
master equation approach suggests that experimentally measured
population and anisotropy kinetics in LH1 and LH2 cannot be described as
a simple hopping between bacteriochlorophyll (BChl) a molecules.
Exciton calculations where also monomeric doubly excited states are
included indicate that the coherence length of the excited state is
about 4 BChl a molecules at room temperature and it increases if
temperature is lowered. Experiments where segments of LH1 antenna with
different sizes were used suggest that the upper limit for the coherence
length at 4 K is 12 BChl a molecules.

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Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Ultrafast Phenomena X : Proceedings of the 10th International Conference, Del Coronado, CA, May 28 – June 1, 1996 - Proceedings of the 10th International Conference, Del Coronado, CA, May 28 – June 1, 1996
series title
Springer Series in Chemical Physics
editor
Barbara, Paul F. ; Fujimoto, James G. ; Knox, Wayne H. and Zinth, Wolfgang
volume
62
pages
2 pages
publisher
Springer
external identifiers
  • scopus:2842538048
ISSN
2364-9003
0172-6218
ISBN
978-3-642-80316-1
978-3-642-80314-7
DOI
10.1007/978-3-642-80314-7_136
language
English
LU publication?
yes
id
3127ea34-b3da-421b-917c-4bfedc7d804c
date added to LUP
2025-08-26 12:05:21
date last changed
2025-09-02 13:22:40
@inproceedings{3127ea34-b3da-421b-917c-4bfedc7d804c,
  abstract     = {{<p>We have studied excitation energy transfer in the photosynthetic antenna<br>
 systems LH1 and LH2 of purple bacteria. Femtosecond pump-probe <br>
experiments were combined with computer simulations using the recently <br>
established structure of these systems to assess the nature of <br>
electronic excitation. We have measured the transient absorption <br>
kinetics and spectra of the LH1 and LH2 complexes in the temperature <br>
range from 4.2 K to 296 K with femtosecond time resolution. The Pauli <br>
master equation approach suggests that experimentally measured <br>
population and anisotropy kinetics in LH1 and LH2 cannot be described as<br>
 a simple hopping between bacteriochlorophyll (BChl) <i>a</i> molecules.<br>
 Exciton calculations where also monomeric doubly excited states are <br>
included indicate that the coherence length of the excited state is <br>
about 4 BChl <i>a</i> molecules at room temperature and it increases if <br>
temperature is lowered. Experiments where segments of LH1 antenna with <br>
different sizes were used suggest that the upper limit for the coherence<br>
 length at 4 K is 12 BChl <i>a</i> molecules.</p>}},
  author       = {{Chachisvilis, M. and Pullerits, T. and Westerhuis, W. and Hunter, C. N. and Sundström, V.}},
  booktitle    = {{Ultrafast Phenomena X : Proceedings of the 10th International Conference, Del Coronado, CA, May 28 – June 1, 1996}},
  editor       = {{Barbara, Paul F. and Fujimoto, James G. and Knox, Wayne H. and Zinth, Wolfgang}},
  isbn         = {{978-3-642-80316-1}},
  issn         = {{2364-9003}},
  language     = {{eng}},
  pages        = {{314--315}},
  publisher    = {{Springer}},
  series       = {{Springer Series in Chemical Physics}},
  title        = {{Elementary excitation in photosynthetic purple bacteria : How big is it?}},
  url          = {{http://dx.doi.org/10.1007/978-3-642-80314-7_136}},
  doi          = {{10.1007/978-3-642-80314-7_136}},
  volume       = {{62}},
  year         = {{1996}},
}