Primary donor state mode structure and energy transfer in bacterial reaction centers

Journal Article · Thu Jul 26 00:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100378a045· OSTI ID:6423333

Johnson, S G; Tang, D; Jankowiak, R; Hayes, J M; Small, G J ^[1]; Tiede, D M ^[2]

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1. Iowa State Univ., Ames (USA)
2. Argonne National Lab., IL (USA)

Temperature-dependent photochemical hole burning data for P870 of Rhodobacter sphaeroides reaction centers (RC) are reported which lead to a determination for the mean frequency of the protein phonons which couple to the optical transition. Utilization of this frequency, {omega}{sub m} {approximately} 25-30 cm{sup {minus}1}, together with improved functions for the single site (RC) absorption line shape and inhomogeneous broadening is shown to lead to significant improvement in the theoretical fits to the hole and absorption spectra (including those of P960 of Rhodopseudomonas virdis). Time-dependent P870 hole spectra are reported which provide additional evidence that the previously observed zero-phonon hole is an intrinsic feature of P870 for active RC. Transient spectra obtained by laser excitation into the accessory Q{sub y}-absorption band of the RC are presented which show an absence of both line narrowing and a dependence on the location of the excitation frequency. These results, which are consistent with ultrafast energy-transfer processes from the accessory states, are discussed in terms of earlier time domain data.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6423333
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 94:15; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
59 BASIC BIOLOGICAL SCIENCES
PHOTOSYNTHETIC REACTION CENTERS
ENERGY TRANSFER
BACTERIA
DATA ANALYSIS
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
PHONONS
TEMPERATURE DEPENDENCE
DATA
INFORMATION
MICROORGANISMS
NUMERICAL DATA
QUASI PARTICLES
400500* - Photochemistry
550200 - Biochemistry