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Optical Control of Electrons During Electron Transfer

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Science  20 Jul 2001:
Vol. 293, Issue 5529, pp. 462-465
DOI: 10.1126/science.1061612

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Abstract

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 Na0: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.

  • * To whom correspondence should be addressed. E-mail: schwartz{at}chem.ucla.edu

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