论文标题
使用弥漫性散射观察X射线驱动的非热融化
Using Diffuse Scattering to Observe X-Ray-Driven Nonthermal Melting
论文作者
论文摘要
我们使用高强度（$ \ sim \！10^{20} \，$ w/cm $^2 $）X射线泵X射线探针方案来观察X-ray heation heation heatiCon的变化。通过避免从单个晶体样品中散射信号中的LAUE斑点，我们观察到弥漫性散射迅速上升，我们将其归因于晶格顺序的损失和向液态的过渡到100 fs的辐照液状态，这是一个时间表，这与第一原理符合第一原理模拟，但比纯粹的惯用惯性行为更快。该方法能够观察液体散射，而无需掩盖或从环境固体中过滤信号，从而可以在整个相变的整个和超越液体结构中测量液体。
We present results from the SPring-8 Angstrom Compact free electron LAser (SACLA) XFEL facility, using a high intensity ($\sim\!10^{20}\,$W/cm$^2$) X-ray pump X-ray probe scheme to observe changes in the ionic structure of silicon induced by X-ray heating of the electrons. By avoiding Laue spots in the scattering signal from a single crystalline sample, we observe a rapid rise in diffuse scattering, which we attribute to a loss of lattice order and a transition to a liquid state within 100 fs of irradiation, a timescale which agrees well with first principles simulations, but is faster than that predicted by purely inertial behavior. This method is capable of observing liquid scattering without masking or filtering of signal from the ambient solid, allowing the liquid structure to be measured throughout and beyond the phase change.
