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Title: Excited-state energy equilibrium via subpicosecond energy transfer within the inhomogeneously broadened light-harvesting antenna of LH-1-only Rhodobacter sphaeroides mutants M2192 at room temperature and 4.2 K

Abstract

Using pump-probe spectroscopy, the dynamics of energy transfer within the inhomogeneously broadened light-harvesting antenna of LH-1-only mutants of the photosynthetic bacterium Rhodobacter sphaeroides was studied at room temperature and 4.2 K. In both cases, the transient difference spectra shift approximately 140 cm{sup -1} to lower energy, with most of the shift occurring within the first picosecond after excitation. Employing an inhomogeneous distribution for the excited-state energies of the subunits in the LH-1 antenna and using a weak coupling (Foerster-type) energy-transfer mechanism, the observations can well be simulated with a transfer time between optimally overlapping antenna subunits at a single lattice distance of approximately 0.28 ps at room temperature (RT) and 0.40 ps at K. We find that the fwhm width of the inhomogeneous distribution function decreases from 400 cm{sup -1} at RT to 200 cm{sup -1} at 4.2 K. 48 refs., 11 figs.

Authors:
; ; ;  [1]
  1. Vrije Universiteit and Inst. for Molecular and Biological Sciences, Amsterdam (Netherlands)
Publication Date:
OSTI Identifier:
437404
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry
Additional Journal Information:
Journal Volume: 100; Journal Issue: 48; Other Information: PBD: 28 Nov 1996
Country of Publication:
United States
Language:
English
Subject:
55 BIOLOGY AND MEDICINE, BASIC STUDIES; 40 CHEMISTRY; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; BACTERIA; ENERGY TRANSFER; PHOTOSYNTHESIS; EXCITED STATES; ENERGY SPECTRA; SIMULATION; MATHEMATICAL MODELS

Citation Formats

Visser, H M, Somsen, O J.G., Mourik, F van, and Grondelle, R van. Excited-state energy equilibrium via subpicosecond energy transfer within the inhomogeneously broadened light-harvesting antenna of LH-1-only Rhodobacter sphaeroides mutants M2192 at room temperature and 4.2 K. United States: N. p., 1996. Web. doi:10.1021/jp960883+.
Visser, H M, Somsen, O J.G., Mourik, F van, & Grondelle, R van. Excited-state energy equilibrium via subpicosecond energy transfer within the inhomogeneously broadened light-harvesting antenna of LH-1-only Rhodobacter sphaeroides mutants M2192 at room temperature and 4.2 K. United States. https://doi.org/10.1021/jp960883+
Visser, H M, Somsen, O J.G., Mourik, F van, and Grondelle, R van. 1996. "Excited-state energy equilibrium via subpicosecond energy transfer within the inhomogeneously broadened light-harvesting antenna of LH-1-only Rhodobacter sphaeroides mutants M2192 at room temperature and 4.2 K". United States. https://doi.org/10.1021/jp960883+.
@article{osti_437404,
title = {Excited-state energy equilibrium via subpicosecond energy transfer within the inhomogeneously broadened light-harvesting antenna of LH-1-only Rhodobacter sphaeroides mutants M2192 at room temperature and 4.2 K},
author = {Visser, H M and Somsen, O J.G. and Mourik, F van and Grondelle, R van},
abstractNote = {Using pump-probe spectroscopy, the dynamics of energy transfer within the inhomogeneously broadened light-harvesting antenna of LH-1-only mutants of the photosynthetic bacterium Rhodobacter sphaeroides was studied at room temperature and 4.2 K. In both cases, the transient difference spectra shift approximately 140 cm{sup -1} to lower energy, with most of the shift occurring within the first picosecond after excitation. Employing an inhomogeneous distribution for the excited-state energies of the subunits in the LH-1 antenna and using a weak coupling (Foerster-type) energy-transfer mechanism, the observations can well be simulated with a transfer time between optimally overlapping antenna subunits at a single lattice distance of approximately 0.28 ps at room temperature (RT) and 0.40 ps at K. We find that the fwhm width of the inhomogeneous distribution function decreases from 400 cm{sup -1} at RT to 200 cm{sup -1} at 4.2 K. 48 refs., 11 figs.},
doi = {10.1021/jp960883+},
url = {https://www.osti.gov/biblio/437404}, journal = {Journal of Physical Chemistry},
number = 48,
volume = 100,
place = {United States},
year = {Thu Nov 28 00:00:00 EST 1996},
month = {Thu Nov 28 00:00:00 EST 1996}
}