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首页> 外文会议>X-Ray FEL Optics and Instrumentation 30-31 July 2000 San Diego, USA >Time resolved x-ray diffraction with subpicosecond x-ray pulses
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Time resolved x-ray diffraction with subpicosecond x-ray pulses

机译：亚皮秒X射线脉冲的时间分辨X射线衍射

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摘要

The emission from plasmas created with fs-lasers provides sub-picosecond x-ray pulses in the ke-V-range. Intenseemission of Kalpha lines as well as quasi continuum x-rays can be used for time-resolved diffraction and spectroscopy, i.e. to study lattice or atomic dynamics with sub-picosecond resolution by using a laser pump - x-ray probe technique. The x-ray yield and x-ray pulse duration of the laser plasma source depend on the laser parameters and the target design, such as intensity, laser wavelength, pulse duration and prepulse level. To accumulate as many photons as possible of the isotropic source an efficient large aperture optic has to be used to select an x-ray line or a wavelength range and focus the radiation onto the sample. It is shown that the use to toroidally bent crystals provides the possibility to refocus 10~(-4) of the photons emitted in the whole solid angle to a spot size of around 80 mum with a temporal broadening below 100 fs. Combinations of bent focusing crystals with a flat sample crystal for fast x-ray diffraction application are discussed. Experiments showing the temporal response of laser heated crystals are presented and compared with theoretical simulations based on Takagi-Taupin theory.
机译：由fs激光器产生的等离子体的发射提供了ke-V范围内的亚皮秒x射线脉冲。 Kalpha线的准渗透以及准连续X射线可用于时间分辨衍射和光谱学，即通过使用激光泵浦-X射线探针技术研究亚皮秒分辨率的晶格或原子动力学。激光等离子体源的X射线产量和X射线脉冲持续时间取决于激光参数和目标设计，例如强度，激光波长，脉冲持续时间和预脉冲水平。为了积累各向同性光源的尽可能多的光子，必须使用高效的大孔径光学器件来选择X射线线或波长范围，并将辐射聚焦到样品上。结果表明，环形弯曲晶体的使用提供了将以整个立体角发射的光子的10〜（-4）重新聚焦到大约80μm的光斑大小并在100fs以下暂时展宽的可能性。讨论了用于快速X射线衍射应用的弯曲聚焦晶体与平坦样品晶体的组合。提出了显示激光加热晶体的时间响应的实验，并与基于Takagi-Taupin理论的理论模拟进行了比较。

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