期刊
PHYSICAL REVIEW LETTERS
卷 19, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.253902
关键词
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资金
- Israel Science Foundation (ISF) [1038/13]
- Marie Curie Integration Grant within the 7th European Union Framework Programme [PCIG13-GA-2013-618118]
- Ministry of Aliyah and Immigrant Absorption of Israel
- Deutsche Forschungsgemeinschaft (DFG) [SFB925]
We report the observation of parametrically down-converted x-ray signal photons at photon energies that correspond to idler photons at optical wavelengths. The count-rate dependence on the angles of the input beam and of the detector and on the slit sizes agrees with theory within the experimental uncertainties. The nonlinear susceptibility, which we calculated from the measured efficiencies, is comparable to the nonlinear susceptibility evaluated from the measurements of x-ray and optical wave mixing. The results of the present Letter advance the development of a spectroscopy method for probing valence-electron charges and the microscopic optical response of crystals with atomic-scale resolution.
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