期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 6, 页码 2128-2131出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja312414y
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资金
- National Science Foundation (NSF) [CHE-1011819]
- NSF
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1011819] Funding Source: National Science Foundation
Time-resolved photoelectron imaging has been utilized to probe the energetics and dynamics of the transient negative ion of the nucleobase uracil. This species was created through charge transfer from an iodide anion within a binary iodide-uracil complex using a UV pump pulse; the ensuing dynamics were followed by photodetachment with a near-IR probe pulse. The photoelectron spectra show two time-dependent features, one from probe-induced photodetachment of the transient anion state and another from very low energy electron signal attributed to autodetachment. The transient anion was observed to decay biexponentially with time constants of hundreds of femtoseconds and tens of picoseconds, depending on the excitation energy. These dynamics are interpreted in terms of autodetachment from the initially excited state and a second, longer-lived species relaxed by iodine loss. Hydrogen loss from the N1 position may also occur in parallel.
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