Journal
SCIENCE
Volume 293, Issue 5529, Pages 462-465Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1061612
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The dynamics of electron transfer reactions in solution can be controlled with the use of a sequence of femtosecond laser pulses. In the charge transfer to solvent (CTTS) reaction of sodide (Na-) in tetrahydrofuran, an initial Light pulse Launched the CTTS reaction, ejecting an electron into either an immediate or a solvent-separated Na-o:solvated electron contact pair. A second pulse was used to excite the electrons in the contact pairs, and a third pulse monitored the amount of Na- produced through the back electron transfer. Excitation of the electrons in immediate contact pairs shut off the back electron transfer, whereas excitation of the electrons in solvent-separated pairs both enhanced and hindered the back electron transfer.
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