Electronic Excitation Transport in Photosynthesis and Crystal and Molecular Structures of Porphyrin Compounds [Dissertation]
- Ames Lab., and Iowa State Univ., Ames, IA (United States)
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:
- Iowa State Univ., Ames, IA (United States); Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5940666
- Report Number(s):
- IS-T--1513; ON: DE91012024
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500* -- Photochemistry
59 BASIC BIOLOGICAL SCIENCES
ALKALINE EARTH METAL COMPLEXES
BOND ANGLE
BOND LENGTHS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLOROPHYLL-BINDING PROTEINS
COMPLEXES
DIMENSIONS
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
EXCITONS
FOOD
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LENGTH
MAGNESIUM COMPLEXES
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NICKEL COMPLEXES
OPTICAL PUMPING
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHOTOSYNTHETIC REACTION CENTERS
PLANTS
POLARIZATION
PORPHYRINS
PROTEINS
PUMPING
QUASI PARTICLES
RYDBERG STATES
SPINACH
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
VEGETABLES