Nonphotochemical hole burning of the native antenna complex of photosystem I (PSI-200)

Journal Article · Thu Feb 23 04:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100341a085· OSTI ID:5039746

Gillie, J K; Small, G J ^[1]; Golbeck, J H ^[2]

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1. Iowa State Univ., Ames (USA)
2. Portland State Univ., OR (USA)

Nonphotochemical hole burning is used to determine the frequencies and Franck-Condon factors for 41 chlorophyll a (Chla) and 15 Chlb intramolecular modes for PSI-200. The linear electron-vibration coupling for all modes is very weak with the maximum Franck-Condon factor observed being {approx} 0.04. No activity by modes with a frequency lower than {approx} 260 cm{sup {minus}1} is observed. The linear electron-phonon coupling for protein modes of mean frequency 22 cm{sup {minus}1} is stronger but can still be categorized as weak since the Huang-Rhys factor is 0.8. The experimental mode and 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. The calculations indicate that it is the phonons (and not the intermolecular modes) that mediate excitation transport within the antenna and from the antenna to the reaction center. They indicate also that a subunit or cluster model for the antenna provides a more accurate picture than the regular array model for excitation transport.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5039746
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:4; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CELL CONSTITUENTS
CHLOROPLASTS
COUPLING
DATA
ELECTRON TRANSFER
ELECTRONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
EXPERIMENTAL DATA
FERMIONS
FOOD
INFORMATION
LEPTONS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NUMERICAL DATA
PHONONS
PLANTS
QUASI PARTICLES
SPINACH
VEGETABLES
VIBRATIONAL STATES