Communication: Effects of thermionic-gun parameters on operating modes in ultrafast electron microscopy

Structural Dynamics
Erik KieftDavid J Flannigan

Abstract

Ultrafast electron microscopes with thermionic guns and LaB6 sources can be operated in both the nanosecond, single-shot and femtosecond, single-electron modes. This has been demonstrated with conventional Wehnelt electrodes and absent any applied bias. Here, by conducting simulations using the General Particle Tracer code, we define the electron-gun parameter space within which various modes may be optimized. The properties of interest include electron collection efficiency, temporal and energy spreads, and effects of laser-pulse duration incident on the LaB6 source. We find that collection efficiencies can reach 100% for all modes, despite there being no bias applied to the electrode.

References

May 11, 2005·Proceedings of the National Academy of Sciences of the United States of America·Vladimir A LobastovAhmed H Zewail
Nov 30, 2006·Proceedings of the National Academy of Sciences of the United States of America·Michael S GrinoldsAhmed H Zewail
May 14, 2008·Physical Chemistry Chemical Physics : PCCP·Andreas GahlmannAhmed H Zewail
Jun 23, 2009·Proceedings of the National Academy of Sciences of the United States of America·Shawn A HilbertAhmed H Zewail
Dec 18, 2009·Nature·Brett BarwickAhmed H Zewail
Apr 10, 2010·Science·Ahmed H Zewail
Nov 3, 2010·Proceedings of the National Academy of Sciences of the United States of America·M AidelsburgerP Baum
Jan 25, 2011·Journal of the American Chemical Society·Sang Tae ParkAhmed H Zewail
Sep 13, 2012·Accounts of Chemical Research·David J Flannigan, Ahmed H Zewail
Jun 28, 2014·Science·Ulrich J Lorenz, Ahmed H Zewail

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Citations

Apr 16, 2016·Nature Communications·Daniel R CremonsDavid J Flannigan
Apr 26, 2016·The Journal of Physical Chemistry. a·Dayne A Plemmons, David J Flannigan
Dec 16, 2016·ACS Applied Materials & Interfaces·Aniruddha AdhikariOmar F Mohammed
May 23, 2017·Structural Dynamics·Young Min LeeOh-Hoon Kwon
Aug 7, 2017·Structural Dynamics·Shaozheng JiJonas Weissenrieder
Oct 24, 2018·Ultramicroscopy·Elisah J VandenBussche, David J Flannigan
Jul 9, 2021·The Journal of Physical Chemistry Letters·Spencer A ReisbickDavid J Flannigan
Oct 15, 2021·Physical Chemistry Chemical Physics : PCCP·Wyatt A Curtis, David J Flannigan

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Methods Mentioned

BETA
electron microscopy

Software Mentioned

General Particle Tracer
General Particle Tracer ( GPT )

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