Transient lattice deformations of crystals studied by means of ultrafast time-resolved x-ray and electron diffraction

IF 2.3 2区物理与天体物理 Q3 CHEMISTRY, PHYSICAL Structural Dynamics-Us Pub Date : 2018-06-27 DOI:10.1063/1.5029970

Runze Li, K. Sundqvist, Jie Chen, H. Elsayed-Ali, Jie Zhang, P. Rentzepis

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引用次数: 6

Abstract

Ultrafast lattice deformation of tens to hundreds of nanometer thick metallic crystals, after femtosecond laser excitation, was measured directly using 8.04 keV subpicosecond x-ray and 59 keV femtosecond electron pulses. Coherent phonons were generated in both single crystal and polycrystalline films. Lattice compression was observed within the first few picoseconds after laser irradiation in single crystal aluminum, which was attributed to the generation of a blast force and the propagation of elastic waves. The different time scales of lattice heating for tens and hundreds nanometer thick films are clearly distinguished by electron and x-ray pulse diffraction. The electron and lattice heating due to ultrafast deposition of photon energy was simulated using the two-temperature model and the results agreed with experimental observations. This study demonstrates that the combination of two complementary ultrafast time-resolved methods, ultrafast x-ray, and electron diffraction will provide a panoramic picture of the transient structural changes in crystals.Ultrafast lattice deformation of tens to hundreds of nanometer thick metallic crystals, after femtosecond laser excitation, was measured directly using 8.04 keV subpicosecond x-ray and 59 keV femtosecond electron pulses. Coherent phonons were generated in both single crystal and polycrystalline films. Lattice compression was observed within the first few picoseconds after laser irradiation in single crystal aluminum, which was attributed to the generation of a blast force and the propagation of elastic waves. The different time scales of lattice heating for tens and hundreds nanometer thick films are clearly distinguished by electron and x-ray pulse diffraction. The electron and lattice heating due to ultrafast deposition of photon energy was simulated using the two-temperature model and the results agreed with experimental observations. This study demonstrates that the combination of two complementary ultrafast time-resolved methods, ultrafast x-ray, and electron diffraction will provide a panoramic pict...

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用超快时间分辨x射线和电子衍射研究晶体的瞬态晶格变形

用8.04直接测量了飞秒激光激发后数十至数百纳米厚金属晶体的超快晶格变形 keV亚皮秒x射线和59 keV飞秒电子脉冲。在单晶和多晶薄膜中都产生了相干声子。在单晶铝中激光照射后的最初几皮秒内观察到晶格压缩，这归因于冲击力的产生和弹性波的传播。通过电子衍射和x射线脉冲衍射，可以清楚地区分数十纳米和数百纳米厚薄膜晶格加热的不同时间尺度。利用双温度模型模拟了光子能量超快沉积引起的电子和晶格加热，结果与实验结果一致。这项研究表明，两种互补的超快时间分辨方法，超快x射线和电子衍射的结合将提供晶体瞬态结构变化的全景图。用8.04直接测量了飞秒激光激发后数十至数百纳米厚金属晶体的超快晶格变形 keV亚皮秒x射线和59 keV飞秒电子脉冲。在单晶和多晶薄膜中都产生了相干声子。在单晶铝中激光照射后的最初几皮秒内观察到晶格压缩，这归因于冲击力的产生和弹性波的传播。通过电子衍射和x射线脉冲衍射，可以清楚地区分数十纳米和数百纳米厚薄膜晶格加热的不同时间尺度。利用双温度模型模拟了光子能量超快沉积引起的电子和晶格加热，结果与实验结果一致。这项研究表明，将两种互补的超快时间分辨方法，超快x射线和电子衍射相结合，将提供一个全景图。。。

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来源期刊

Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

CiteScore

5.50

自引率

3.60%

发文量

审稿时长

16 weeks

期刊介绍： Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.