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Languages : en
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Electron tunneling leads to transfer of trapped positive, or negative charge tens of angstroms in rigid matrices. Franck-Condon effects give energy specificity to charge transfer and ion recombination, and adds sensitivity to molecular structure, solvation and H/D isotope effects. The specificity is important in photosynthesis and solar energy storage as well as in radiation chemistry. We feel that the question of hopping vs. tunneling is definitely settled in favor of tunneling for intermolecular electron transfer at low temperatures. Hopping cannot yet be conclusively ruled out in reactions of trapped electrons. Hopping is expected to become important in many media near room temperature (T approx. less than 200°K).
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Languages : en
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Book Description
Electron tunneling leads to transfer of trapped positive, or negative charge tens of angstroms in rigid matrices. Franck-Condon effects give energy specificity to charge transfer and ion recombination, and adds sensitivity to molecular structure, solvation and H/D isotope effects. The specificity is important in photosynthesis and solar energy storage as well as in radiation chemistry. We feel that the question of hopping vs. tunneling is definitely settled in favor of tunneling for intermolecular electron transfer at low temperatures. Hopping cannot yet be conclusively ruled out in reactions of trapped electrons. Hopping is expected to become important in many media near room temperature (T approx. less than 200°K).
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Category : Power resources
Languages : en
Pages : 316
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Category : Ionizing radiation
Languages : en
Pages : 1062
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Author: David Nathan Beratan
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Category : Born-Oppenheimer approximation
Languages : en
Pages : 254
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The rate of electron transport between distant sites was studied. The rate depends crucially on the chemical details of the donor, acceptor, and surrounding medium. These reactions involve electron tunneling through the intervening medium and are, therefore, profoundly influenced by the geometry and energetics of the intervening molecules. The dependence of rate on distance was considered for several rigid donor-acceptor "linkers" of experimental importance. Interpretation of existing experiments and predictions for new experiments were made. The electronic and nuclear motion in molecules is correlated. A Born-Oppenheimer separation is usually employed in quantum chemistry to separate this motion. Long distance electron transfer rate calculations require the total donor wave function when the electron is very far from its binding nuclei. The Born-Oppenheimer wave functions at large electronic distance are shown to be qualitatively wrong. A model which correctly treats the coupling was proposed. The distance and energy dependence of the electron transfer rate was determined for such a model.
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Category : Nuclear energy
Languages : en
Pages : 1214
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ISBN:
Category : Science
Languages : en
Pages : 1288
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Author: Rafail Fattakhovitch Khaïroutdinov
Publisher:
ISBN: 9780444416315
Category : Charge exchange
Languages : en
Pages : 359
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Book Description
Author: D.S. Bendall
Publisher: Garland Science
ISBN: 1859960405
Category : Medical
Languages : en
Pages : 322
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This book melds theory and experiment together in a fundamental aspect of protein biology to develop a framework of ideas that can be applied to a variety of systems. It discusses the crystal structures of electron transfer proteins and complexes.
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Category : Government reports announcements & index
Languages : en
Pages : 1654
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Author: R. G. Compton
Publisher:
ISBN: 9780444416315
Category : Charge exchange
Languages : en
Pages : 359
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