Excitation Wavelength Dependence of Bacterial Reaction Center Photochemistry. 1. Ground State and Excited State Evolution

The effect of excitation wavelength dependence on the ground state absorption excited state stimulated emission, and the electron transfer process in reaction centers from the R-26 carotenoidless strain of the bacterium Rhodobacter sphaeroides was studied using time-resolved hole-burning spectroscop...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physical chemistry (1952) 1995-01, Vol.99 (4), p.1349-1356
Main Authors: Peloquin, Jeffrey M, Lin, Su, Taguchi, Aileen K. W, Woodbury, Neal W
Format: Article
Language:English
Subjects:
400102 - Chemical & Spectral Procedures
400500 - Photochemistry
ABSORPTION SPECTRA
BACTERIA
CHEMISTRY
ELECTRON TRANSFER
EMISSION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FREQUENCY DEPENDENCE
GROUND STATES
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MICROORGANISMS
P STATES
PHOTOCHEMISTRY
PHOTOSYNTHETIC BACTERIA
PHOTOSYNTHETIC REACTION CENTERS
SPECTRA
STIMULATED EMISSION
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The effect of excitation wavelength dependence on the ground state absorption excited state stimulated emission, and the electron transfer process in reaction centers from the R-26 carotenoidless strain of the bacterium Rhodobacter sphaeroides was studied using time-resolved hole-burning spectroscopy. The P super(*) state was prepared using 838, 858, 878, and 892 nm excitation pulses which had a temporal width of approximately 150 fs and a spectral width of about 60 cm super(-). The majority of the stimulated emission from P super(*) moves to wavelengths greater than 890 nm, within the first 200 fs following excitation. If confirmational subpopulations do exist in the excited state with different rates of electron transfer, they appear to be distinct from the confirmational subpopulations in the ground state which give rise to the distribution of P arrow right P super(*) transition energies.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100004a040