Spectral hole burning studies of Photosystem I
Persistent spectral hole burning is applied to the reaction center, P700, and the light harvesting chlorophyll protein complexes of Photosystem I. A theory for solid state spectral hole burning is developed that is valid for arbitrarily strong linear electron-phonon coupling within the Condon approximation. Persistent photochemical hole burning of the reaction center P700, reveals that a broad ({approximately}300 cm{sup {minus}1}) hole can be burned into the absorption profile. The hole profile and its maximum position and intensity dependence on burn wavelength are adequately fit by the electron-phonon coupling theory. The results indicate that the absorption and hole profile are dominated by phonon transitions with a Huang-Rhys factor of {approximately}8. A dimer structure for P700 is supported. The similarities to the primary electron donor states of other reaction centers are examined. Nonphotochemical hole burning spectra for the Q{sub y} transitions associated with the light harvesting antenna complex of Photosystem I are presented. The frequencies and Franck-Condon factors are determined for 41 chlorophyll a and 12 chlorophyll b intramolecular modes. The electron-phonon coupling of the antenna system is compared with that for P700. The intramolecular modes, phonon frequencies, and Franck-Condon factors are used with multiphonon excitation transport theories to analyze the available temperature-dependent data on the kinetics of transport within the core antenna complex.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6879252
- Report Number(s):
- IS-T-1480; ON: DE90011737
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
PHOTOSYNTHETIC REACTION CENTERS
PHOTOCHEMICAL REACTIONS
ABSORPTION SPECTRA
CHLOROPHYLL
EXCITED STATES
PHOTOCHEMISTRY
PROTEINS
RHODOPSEUDOMONAS
BACTERIA
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHEMISTRY
ENERGY LEVELS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MICROORGANISMS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PORPHYRINS
SPECTRA
400500* - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)