期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 8, 期 10, 页码 2229-2235出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b00877
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资金
- University of New South Wales
- Australian Research Council [DP130101658]
Ultrafast charge migration is of fundamental importance to photoinduced chemical reactions. However, exploring such a quantum dynamical process requires demanding spatial and temporal resolutions. We show how electronic coherence dynamics induced in molecules by a circularly polarized UV pulse can be tracked by using a time delayed circularly polarized attosecond X-ray pulse. The X-ray probe spectra retrieve an image at different time delays, encoding instantaneous pump-induced circular charge migration information on an attosecond time scale. A time-dependent ultrafast electronic coherence associated with the periodical circular ring currents shows a strong dependence on the helicity of the UV pulse, which may provide a direct approach 'to access and control the electronic quantum coherence dynamics in photophysical and photochemical reactions in real time.
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