Ultrafast Electron Diffraction with Spatiotemporal Resolution of Atomic Motion

Ultrafast electron diffraction （UED） is a rapidly advancing technique capable of recording the atomic-detail structural dynamics in real time. We report the establishment of the first UED system in China. Employing this UED apparatus, both the coherent and the concurrent thermal lattice motions in an aluminium thin-film, trigged by ultrafast laser heating, have been observed. These results demonstrate its ability to directly measure a sub-milli-angstrom lattice spacing change on a sub-picosecond time scale.

Ultrafast 电子衍射(UED ) 是能够在实时记录原子详细的结构的动力学的一种很快进展的技术。我们在中国报导第一个 UED 系统的建立。采用这台 UED 仪器，两协调并且在铝的并发的热格子运动薄电影，由极端快激光加热的 trigged，被观察了。这些结果表明它的能力直接在亚微微秒时间规模上测量一个 sub-milli-angstrom 格子间距变化。