Ultrafast electron microscopy in material science
Ultrafast electron microscopy in material science
复制标题
材料科学中的超快电子显微镜
DOI：
10.1088/1674-1056/27/7/070703
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发表时间：
2018
影响因子：
1.7
通讯作者：
Li Jianqi
中科院分区：
文献类型：
--
作者：
Yang Huaixin;Sun Shuaishuai;Zhang Ming;Li Zhongwen;Li Zian;Xu Peng;Tian Huanfang;Li Jianqi
超快透射电子显微镜（UTEM）的最新进展，结合了空间和时间分辨率，使人们有可能直接可视化材料的原子，电子和磁结构动力学。在这篇综述中，我们重点介绍了UTEM技术的最新进展及其在各种材料系统中的应用。它强调，许多重大的超快动力学问题，在材料科学中可以解决的泵浦-探测方法与发达的传统透射电子显微镜（TEM）技术的集成。例如，可以进行UTEM衍射实验来研究光致原子尺度动力学，包括化学反应、非平衡相变/熔化和晶格声子耦合。UTEM成像方法是非常宝贵的研究，在真实的空间，结构和形态变化的基本过程，以及在洛伦兹TEM模式，在高放大率的磁畴演化。UTEM电子能量损失光谱技术允许超快价态和电子结构动力学的检查，而光致近场电子显微镜扩展的UTEM的电磁场成像与高真实的空间分辨率的制度的能力。
Recent advances in the ultrafast transmission electron microscope (UTEM), with combined spatial and temporal resolutions, have made it possible to directly visualize the atomic, electronic, and magnetic structural dynamics of materials. In this review, we highlight the recent progress of UTEM techniques and their applications to a variety of material systems. It is emphasized that numerous significant ultrafast dynamic issues in material science can be solved by the integration of the pump–probe approach with the well-developed conventional transmission electron microscopy (TEM) techniques. For instance, UTEM diffraction experiments can be performed to investigate photoinduced atomic-scale dynamics, including the chemical reactions, non-equilibrium phase transition/melting, and lattice phonon coupling. UTEM imaging methods are invaluable for studying, in real space, the elementary processes of structural and morphological changes, as well as magnetic-domain evolution in the Lorentz TEM mode, at a high magnification. UTEM electron energy-loss spectroscopic techniques allow the examination of the ultrafast valence states and electronic structure dynamics, while photoinduced near-field electron microscopy extends the capability of the UTEM to the regime of electromagnetic-field imaging with a high real space resolution.