Ultrafast structural dynamics studied by kilohertz time-resolved x-ray diffraction

• 作者: Chen Jie 江舟亚 辛建国 郭鑫 陈洁 陈黎明 陈龙
• 来源期刊: 中国物理B（英文版）
• 关键词: ultrafast x-ray diffraction transient structures lattice deformation
• 年，卷（期）: 2015,（10）
• 页码范围: 108701-1-108701-5
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/10/108701

摘要

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 × 1010 photons/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.