Spectral hole burning studies of Photosystem I

Technical Report · Mon Jan 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/6879252· OSTI ID:6879252

Gillie, J K

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., IA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6879252
• Report Number(s): IS-T-1480; ON: DE90011737
• Country of Publication: United States
• Language: English

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ABSORPTION SPECTRA
BACTERIA
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHEMISTRY
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HETEROCYCLIC ACIDS
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PHOTOCHEMISTRY
PHOTOSYNTHETIC REACTION CENTERS
PHYTOCHROMES
PIGMENTS
PORPHYRINS
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RHODOPSEUDOMONAS
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