Single-Shot Electron Diffraction using a Cold Atom Electron Source

TL;DR

This paper demonstrates single-shot nanosecond electron diffraction using a cold atom electron source, showing its potential for high-brightness, ultrafast imaging of nanostructures and surface dynamics.

Contribution

It introduces the first single-shot, nanosecond electron diffraction from monocrystalline gold using a cold atom electron source, highlighting its advantages over traditional sources.

Findings

Successful single-shot diffraction images obtained

Higher signal-to-noise ratio with image registration

Potential for resolving nanosecond surface dynamics

Abstract

Cold atom electron sources are a promising alternative to traditional photocathode sources for use in ultrafast electron diffraction due to greatly reduced electron temperature at creation, and the potential for a corresponding increase in brightness. Here we demonstrate single-shot, nanosecond electron diffraction from monocrystalline gold using cold electron bunches generated in a cold atom electron source. The diffraction patterns have sufficient signal to allow registration of multiple single-shot images, generating an averaged image with significantly higher signal-to-noise ratio than obtained with unregistered averaging. Reflection high-energy electron diffraction (RHEED) was also demonstrated, showing that cold atom electron sources may be useful in resolving nanosecond dynamics of nanometre scale near-surface structures.