Robinson Matthew S, Lane Paul D, Wann Derek A
Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom.
Rev Sci Instrum. 2015 Jan;86(1):013109. doi: 10.1063/1.4905335.
A novel compact time-resolved electron diffractometer has been built with the primary goal of studying the ultrafast molecular dynamics of photoexcited gas-phase molecules. Here, we discuss the design of the electron gun, which is triggered by a Ti:Sapphire laser, before detailing a series of calibration experiments relating to the electron-beam properties. As a further test of the apparatus, initial diffraction patterns have been collected for thin, polycrystalline platinum samples, which have been shown to match theoretical patterns. The data collected demonstrate the focusing effects of the magnetic lens on the electron beam, and how this relates to the spatial resolution of the diffraction pattern.
一种新型紧凑型时间分辨电子衍射仪已建成，其主要目的是研究光激发气相分子的超快分子动力学。在这里，我们先讨论由钛宝石激光器触发的电子枪的设计，然后详细介绍一系列与电子束特性相关的校准实验。作为对该仪器的进一步测试，已收集了薄的多晶铂样品的初始衍射图案，结果表明这些图案与理论图案相匹配。所收集的数据展示了磁透镜对电子束的聚焦作用，以及这与衍射图案的空间分辨率之间的关系。
