The rapid growth of the field of time-resolved and ultrafast electron microscopy has been accompanied by the active development of new instrumentation. Recently, time-resolved microscopes equipped with a field emission gun have been introduced, demonstrating great potential for experiments that benefit from the high brightness and coherence of the electron source. Here, we describe a straightforward design of a time-resolved transmission electron microscope with a Schottky field emission gun and characterize its performance. At the same time, our design gives us the flexibility to alternatively operate the instrument as if it was equipped with a flat metal photocathode. We can, thus, effectively choose to sacrifice brightness in order to obtain pulses with vastly larger numbers of electrons than from the emitter if for a given application the number of electrons is a crucial figure of merit. We believe that our straightforward and flexible design will be of great practical relevance to researchers wishing to enter the field.

中文翻译：

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使用肖特基场发射枪对时间分辨电子显微镜进行表征

时间分辨和超快电子显微镜领域的快速发展伴随着新仪器的积极发展。最近，已经推出了配备有场发射枪的时间分辨显微镜，证明了受益于电子源高亮度和相干性的实验的巨大潜力。在这里，我们描述了一种具有肖特基场发射枪的时间分辨透射电子显微镜的简单设计，并对其性能进行了表征。同时，我们的设计使我们可以灵活地选择操作仪器，就​​像它配备了扁平金属光电阴极一样。因此，我们可以 如果对于给定的应用，电子数量是一个关键的品质因数，则有效地选择牺牲亮度以获取具有比来自发射器的电子数量大得多的电子数量的脉冲。我们相信，我们简单而灵活的设计对于希望进入该领域的研究人员将具有重大的现实意义。