Energy transfer processes in solar energy conversion
This program involves the experimental and theoretical study of optically induced electron transfer and electronic excitation transport in systems with complex structures. The focus is to obtain an understanding of the intimate interplay among intermolecular interactions, structure, and dynamics. A combination of picosecond transient grating experiments, time resolved fluorescence depolarization experiments, conventional optical spectroscopy, and statistical mechanical theory is being employed to elucidated fundamental aspects of processes which are important in the conversion of solar energy to usable forms of energy. We are continuing to address the very important problem of electron back transfer following optically induced donor to acceptor electron transfer. In a system in which there are donors (low concentration) and acceptors (high concentration) randomly distributed in solution, optical excitation of a donor can be followed by transfer of an electron to an acceptor. One electron transfer has occurred. there exists a ground state radical cation (D{sup +}) near a ground state radical anion (A{sup {minus}}). Since the thermodynamically stable state is neutral ground state D and A, back transfer will occur. The electron will back transfer from A{sup {minus}} to D{sup +} to regenerate the neutral species. In liquid solution, back transfer competes with separation by diffusion. Separated ions are extremely reactive and can go on to do useful chemistry. 10 refs.
- Research Organization:
- Stanford Univ., CA (United States). Dept. of Chemistry
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG03-84ER13251
- OSTI ID:
- 6369309
- Report Number(s):
- DOE/ER/13251-T5; ON: DE92003465
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
EXCITED STATES
ELECTRON TRANSFER
FLUORESCENCE
QUENCHING
POLYMERS
PHASE STUDIES
DIFFUSION
DYE LASERS
PHOTOCHEMICAL REACTIONS
PROGRESS REPORT
RADICALS
SOLAR ENERGY CONVERSION
STATISTICAL MECHANICS
CHEMICAL REACTIONS
CONVERSION
DOCUMENT TYPES
ENERGY CONVERSION
ENERGY LEVELS
LASERS
LIQUID LASERS
LUMINESCENCE
MECHANICS
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
400500 - Photochemistry