Time‐resolved X‐ray reflection phases of the nearly forbidden Si(222) reflection under laser excitation

The covalent electron density, which makes Si(222) measurable, is subject to laser excitation. The three‐wave Si(222)/() diffraction at 7.82 keV is used for phase measurements. It is found that laser excitation causes a relative phase change of around 4° in Si(222) in the first 100 ps of excitation...

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Veröffentlicht in:Journal of synchrotron radiation 2019-05, Vol.26 (3), p.819-824
Hauptverfasser: Tsai, Yi-Wei, Chang, Ying-Yi, Lee, Jey-Jau, Liu, Wen-Chung, Wu, Yu-Hsin, Liu, Wei-Rein, Liu, Hsing-Yu, Lee, Kun-Yuan, Weng, Shih-Chang, Sheu, Hwo-Shuenn, Chiu, Mau-Sen, Lee, Yin-Yu, Hsu, Chia-Hung, Chang, Shih-Lin
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Sprache:eng
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Zusammenfassung:The covalent electron density, which makes Si(222) measurable, is subject to laser excitation. The three‐wave Si(222)/() diffraction at 7.82 keV is used for phase measurements. It is found that laser excitation causes a relative phase change of around 4° in Si(222) in the first 100 ps of excitation and this is gradually recovered over several nanoseconds. This phase change is due to laser excitation of covalent electrons around the silicon atoms in the unit cell and makes the electron density deviate further from the centrosymmetric distribution. Time‐resolved X‐ray reflection phases of the nearly forbidden Si(222) reflection under laser excitation are investigated using multiple‐wave diffraction at 7.82 keV. A relative phase change of around 4° of Si(222) in the first 100 ps of laser excitation and its gradual recovery over several nanoseconds are observed.
ISSN:1600-5775
0909-0495
1600-5775
DOI:10.1107/S1600577519003503