Inter- and intraband energy transfer in LH2-antenna complexes of purple bacteria. A fluorescence line-narrowing and hole-burning study
Journal Article
·
· Journal of Physical Chemistry; (United States)
- Univ. of Leiden (Netherlands)
- Free Univ., Amsterdam (Netherlands)
- Univ. of Leiden (Netherlands) Free Univ., Amsterdam (Netherlands)
High-resolution site-selection fluorescence- and hole-burning spectroscopy were used to study energy transfer in two LH2 light-harvesting complexes of purple bacteria: the B800-850 complex of isolated Rb. sphaeroides and the B800-820 complex of Rps. acidophila, at 1.2 K. Fluorescence spectra, hole widths, and hole depths were measured as a function of excitation wavelength [lambda][sub exc] within the B800 band. For [lambda][sub exc] [>=] 798 nm, fluorescence line-narrowing is observed and the energy-transfer times ([tau] = 2.5 and 2.0 ps for B800-850 and B800-820, respectively) are independent of [lambda][sub exc]. In this spectral region only interband B800 [yields] B850 (B820) energy transfer takes place. For 780 nm [<=] [lambda][sub exc] [<=] 798 nm, the fluorescence bands are broad and the transfer time, obtained from hole widths extrapolated to zero burning-fluorence density, decreases toward the blue side of B800. In this wavelength region competition occurs between B800 [yields] B850 (B820) and B800 [yields] B800 [open quotes]downhill[close quotes] energy transfer. 36 refs., 5 figs.
- OSTI ID:
- 6778073
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:41; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Thu Jul 18 00:00:00 EDT 1996
· Journal of Physical Chemistry
·
OSTI ID:380818
Relaxation dynamics of the LH2 complex from a photosynthetic purple bacterium Thiorhodospira sibirica studied by the near-IR femtosecond pump-probe method
Journal Article
·
Sun Jan 30 23:00:00 EST 2005
· Quantum Electronics (Woodbury, N.Y.)
·
OSTI ID:21470678
Characterisation of the LH2 spectral variants produced by the photosynthetic purple sulphur bacterium Allochromatium vinosum
Journal Article
·
Sat Nov 01 00:00:00 EDT 2014
· Biochimica et Biophysica Acta - Bioenergetics
·
OSTI ID:1150020
Related Subjects
14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400500 -- Photochemistry
550200 -- Biochemistry
550700 -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
BACTERIA
EMISSION SPECTROSCOPY
ENERGY TRANSFER
FLUORESCENCE SPECTROSCOPY
LASERS
MATHEMATICAL MODELS
MICROORGANISMS
PHOTOSYNTHETIC BACTERIA
PHOTOSYNTHETIC REACTION CENTERS
PIGMENTS
SPECTROSCOPY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400500 -- Photochemistry
550200 -- Biochemistry
550700 -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
BACTERIA
EMISSION SPECTROSCOPY
ENERGY TRANSFER
FLUORESCENCE SPECTROSCOPY
LASERS
MATHEMATICAL MODELS
MICROORGANISMS
PHOTOSYNTHETIC BACTERIA
PHOTOSYNTHETIC REACTION CENTERS
PIGMENTS
SPECTROSCOPY