论文标题
分裂脉冲X射线光子相关光谱与从X射线激光器到研究原子水平动力学的X射线X射线相关光谱
Split-pulse X-ray photon correlation spectroscopy with seeded X-rays from X-ray laser to study atomic-level dynamics
论文作者
论文摘要
X射线自由电子激光凭借其光彩和时间结构可以揭示超快现象的原子尺度细节。分裂和延迟光学器件（SDO）的最新进展（SDO）产生了两种X射线脉冲随时间延期，为观察原子级动力学的前景提供了明亮的前景。但是，它们的脉冲能量不足已限制了其对具有更长相关长度的现象的应用，或者使用固定延迟时间进行测量。在这里，我们表明，SDO和X射线自我播种的组合增加了脉冲能量，并可以在Picseconds的时间表中观察原子级动力学。我们表明，从水散射中的斑点对比取决于预期的延迟时间。我们的结果表明，使用SDO和种子X射线的SDO能够在时间和空间尺度上解决动力学，而其他技术无法访问这些动力学，从而为研究原子级动力学提供了机会。
With their brilliance and temporal structure, X-ray free-electron laser can unveil atomic-scale details of ultrafast phenomena. Recent progress in split-and-delay optics (SDO), which produces two X-ray pulses with time-delays, offers bright prospects for observing dynamics at the atomic-scale. However, their insufficient pulse energy has limited its application either to phenomena with longer correlation length or to measurement with a fixed delay-time. Here we show that the combination of the SDO and self-seeding of X-rays increases the pulse energy and makes it possible to observe the atomic-scale dynamics in a timescale of picoseconds. We show that the speckle contrast in scattering from water depends on the delay-time as expected. Our results demonstrate the capability of measurement using the SDO with seeded X-rays for resolving the dynamics in temporal and spatial scales that are not accessible by other techniques, opening opportunities for studying the atomic-level dynamics.
