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Characterization of a time-resolved electron microscope with a Schottky field emission gun
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Characterization of a time-resolved electron microscope with a Schottky field emission gun
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Journal Article
Characterization of a time-resolved electron microscope with a Schottky field emission gun
2020
Overview
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.
Publisher
American Institute of Physics, Inc,American Crystallographic Association,AIP Publishing LLC and ACA
Subject
