Electronic excitation transport in photosynthesis and crystal and molecular structures of porphyrin compounds
The excitation energy transfer in three photosynthetic organism samples, Bacteriochlorophyll a-protein from Prosthecochloris aestuarii, and enriched photosystem I particles from spinach chloroplasts, have been investigated by pump-probe ultrafast spectroscopy. The isotropic photobleaching profiles were best described by two exponential decay components in one Bchl a-protein complex, and three exponential decay components in another. The experimental results from the three samples show that nonrandom chromophore orientations exist and Sauer's pebble mosaic'' model is an appropriate one for excitation transfer in these samples. The polarized pump-probe transients have been analyzed in terms of an exciton hopping model that incorporates the known geometry of the Bchl a-protein. The crystal and molecular structures of four metalloporphyrins have been determined by X-ray diffraction and molecular mechanics. 207 refs., 44 figs., 15 tabs.
- Research Organization:
- Ames Lab., IA (USA)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5940666
- Report Number(s):
- IS-T-1513; ON: DE91012024
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Ultrafast pump-probe spectroscopy of electronic excitation transfer in random molecular systems and in photosynthetic antennae
Ultrafast pump-probe spectroscopy of electronic excitation transfer in random molecular systems and in photosynthetic antennae
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
CHLOROPHYLL-BINDING PROTEINS
RYDBERG STATES
PHOTOSYNTHETIC REACTION CENTERS
ENERGY TRANSFER
EXCITATION
PORPHYRINS
STRUCTURAL CHEMICAL ANALYSIS
BOND ANGLE
BOND LENGTHS
EXCITONS
MAGNESIUM COMPLEXES
NICKEL COMPLEXES
OPTICAL PUMPING
PHOTOSYNTHESIS
POLARIZATION
SPINACH
ALKALINE EARTH METAL COMPLEXES
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COMPLEXES
DIMENSIONS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FOOD
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LENGTH
MAGNOLIOPHYTA
MAGNOLIOPSIDA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
PROTEINS
PUMPING
QUASI PARTICLES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
VEGETABLES
400500* - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
400201 - Chemical & Physicochemical Properties