期刊
SCIENCE
卷 342, 期 6165, 页码 1496-1499出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1246291
关键词
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资金
- National Science Foundation (NSF) [CHE-1011819]
- Direct For Mathematical & Physical Scien [1011819] Funding Source: National Science Foundation
- Division Of Chemistry [1011819] Funding Source: National Science Foundation
The relaxation dynamics of the photoexcited hydrated electron have been subject to conflicting interpretations. Here, we report time-resolved photoelectron spectra of hydrated electrons in a liquid microjet with the aim of clarifying ambiguities from previous experiments. A sequence of three ultrashort laser pulses (similar to 100 femtosecond duration) successively created hydrated electrons by charge-transfer-to-solvent excitation of dissolved anions, electronically excited these electrons via the s -> p transition, and then ejected them into vacuum. Two distinct transient signals were observed. One was assigned to the initially excited p-state with a lifetime of similar to 75 femtoseconds, and the other, with a lifetime of similar to 400 femtoseconds, was attributed to s-state electrons just after internal conversion in a nonequilibrated solvent environment. These assignments support the nonadiabatic relaxation model.
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