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Structural dynamics probed by high-coherence electron pulses

机译:高相干电子脉冲探测的结构动力学

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Ultrafast measurement technology provides essential contributions to our understanding of the properties and functions of solids and nanostructures. Atomic-scale vistas with ever-growing spatial and temporal resolution are offered by methods based on short pulses of x-rays and electrons. Time-resolved electron diffraction and microscopy are among the most powerful approaches to investigate nonequilibrium structural dynamics. In this article, we discuss recent advances in ultrafast electron imaging enabled by significant improvements in the coherence of pulsed electron beams. Specifically, we review the development and first application of ultrafast low-energy electron diffraction for the study of structural dynamics at surfaces, and discuss novel opportunities for ultrafast transmission electron microscopy facilitated by laser-triggered field-emission sources. These and further developments will render coherent electron beams an essential component in future ultrafast nanoscale imaging.
机译:超快测量技术为我们对固体和纳米结构的特性和功能的理解做出了重要贡献。基于X射线和电子的短脉冲的方法提供了具有不断增长的空间和时间分辨率的原子尺度远景。时间分辨电子衍射和显微镜检查是研究非平衡结构动力学的最有效方法之一。在本文中,我们将讨论脉冲电子束相干性的显着改善,从而实现超快电子成像的最新进展。具体来说,我们回顾了超快速低能电子衍射在表面结构动力学研究中的发展和首次应用,并讨论了由激光触发的场发射源促进的超快速透射电子显微镜的新机会。这些和进一步的发展将使相干电子束成为未来超快纳米级成像的重要组成部分。

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