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Near-Threshold Photoemission from Graphene-Coated Cu(110)

Christopher J. Knill1,*, Hisato Yamaguchi2, Kenji Kawahara3, Gaoxue Wang2, Enrique Batista2, Ping Yang2, Hiroki Ago3, Nathan Moody2, and Siddharth Karkare1,†

  • 1Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
  • 2Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 3Global Innovation Center, Kyushu University, Kasuga, Fukuoka 816-8580, Japan

  • *Authors to whom correspondence should be addressed: cknill2@asu.edu
  • †Authors to whom correspondence should be addressed: karkare@asu.edu
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Phys. Rev. Applied 19, 014015 – Published 5 January, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.014015

Abstract

The brightness of electron beams emitted from photocathode sources plays a critical role in determining the performance of x-ray free-electron lasers and ultrafast electron-diffraction applications. In order to achieve the maximum brightness, the electrons need to be emitted from a photocathode with the lowest-possible mean transverse energy (MTE). Recent investigations have shown that capping a Cu(110) photocathode with a monolayer of graphene can protect the quantum efficiency (QE) from long-term exposure to varying vacuum conditions. However, there have been no studies that investigate the effects that a monolayer of graphene has on the MTE. Here, we report on measurements of a graphene-coated Cu(110) single crystal near the photoemission threshold for room and liquid-nitrogen temperatures. At room temperature, a minimum MTE of 25 meV is measured at 295 nm. At liquid-nitrogen temperatures, a minimum MTE of 9 meV is measured at the photoemission threshold of 290 nm.

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Corrections

20 January, 2023

Correction: Two support statements were missing from the Acknowledgment section and have been inserted.

Article Text

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Outline

Information

Phys. Rev. Applied 19, 014015– Published 5 January, 2023
  • Received 9 August 2022
  • Revised 2 November 2022
  • Accepted 12 December 2022
  • Corrected 20 January 2023
Article part of CHORUS
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