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Direct and real-time probing of both coherent and thermal lattice motions

机译：直接和实时探测相干和热晶格运动

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摘要

We report direct measurement of laser-induced ultrafast structural dynamics on the atomic time and length scales in a 20-nm Al film by taking real-time snapshots of transmission electron diffraction patterns. The damped single-mode breathing motion of the Al film along the surface normal was recorded as coherent and in-phase oscillations of all the Bragg peak positions, which had a period of 6.4 ps. The concurrent lattice heating with a time constant of 630 fs was measured by tracking the associated Bragg peak intensity attenuation. These results suggest a direct approach to identify the mechanisms of laser-induced ultrafast solid-liquid phase transition, as well as thermal or non-thermal melting, via probing the temporal evolution of their diffraction patterns.
机译：我们通过对透射电子衍射图样进行实时快照，报告了在20 nm铝膜中原子时间和长度尺度上的激光诱导的超快结构动力学的直接测量。 Al薄膜沿表面法线的阻尼单模呼吸运动记录为所有Bragg峰值位置的相干和同相振荡，周期为6.4 ps。通过跟踪相关的布拉格峰强度衰减来测量时间常数为630 fs的同时晶格加热。这些结果表明，通过探测其衍射图的时间演变，可以找到一种直接方法来确定激光诱导的超快固液相转变以及热或非热融化的机理。

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