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Ultrafast structural dynamics studied by kilohertz time-resolved x-ray diffraction |
Guo Xin (郭鑫)a b, Jiang Zhou-Ya (江舟亚)c d, Chen Long (陈龙)c d, Chen Li-Ming (陈黎明)b d, Xin Jian-Guo (辛建国)a, Peter M. Rentzepise, Chen Jie (陈洁)c d |
a School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China; b Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; c Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China; d IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China; e Electrical & Computer Engineering, Texas A & M University, College Station, TX 77843, USA |
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Abstract Ultrashort multi-keV x-ray pulses are generated by electron plasma produced by the irradiation of femtosecond pulses on metals. These sub-picosecond x-ray pulses have extended the field of x-ray spectroscopy into the femtosecond time domain. However, pulse-to-pulse instability and long data acquisition time restrict the application of ultrashort x-ray systems operating at low repetition rates. Here we report on the performance of a femtosecond laser plasma-induced hard x-ray source that operates at 1-kHz repetition rate, and provides a flux of 2.0×1010photons/s of Cu Kα radiation. Using this system for time-resolved x-ray diffraction experiments, we record in real time, the transient processes and structural changes induced by the interaction of 400-nm femtosecond pulse with the surface of a 200-nm thick Au (111) single crystal.
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Received: 29 January 2015
Revised: 21 May 2015
Accepted manuscript online:
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PACS:
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87.15.ht
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(Ultrafast dynamics; charge transfer)
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67.80.de
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(Structure, lattice dynamics and sound)
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63.70.+h
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(Statistical mechanics of lattice vibrations and displacive phase transitions)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61222509 and 11421064) and the W. M. Keck Foundation. |
Corresponding Authors:
Chen Jie
E-mail: jiec@sjtu.edu.cn
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Cite this article:
Guo Xin (郭鑫), Jiang Zhou-Ya (江舟亚), Chen Long (陈龙), Chen Li-Ming (陈黎明), Xin Jian-Guo (辛建国), Peter M. Rentzepis, Chen Jie (陈洁) Ultrafast structural dynamics studied by kilohertz time-resolved x-ray diffraction 2015 Chin. Phys. B 24 108701
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