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Single-photoelectron collection efficiency in 4D ultrafast electron microscopy.

Wyatt A Curtis1,2, Simon A Willis1,2, David J Flannigan1,2

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Understanding photoelectron trajectories in ultrafast electron microscopy (UEM) is key to improving collection efficiency (CE). This study reveals how laser parameters and gun elements significantly impact CE in single-electron regimes for femtosecond 4D UEM.

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Area of Science:

  • Physics
  • Materials Science
  • Electron Microscopy

Background:

  • Femtosecond 4D ultrafast electron microscopy (UEM) faces a trade-off between photoelectron density and time resolution.
  • Long acquisition times in low-density packets, especially at low repetition rates, necessitate understanding photoelectron behavior.
  • Collection efficiency (CE) is crucial for optimizing UEM performance.

Purpose of the Study:

  • To systematically study photoelectron trajectories in the gun region of a femtosecond 4D UEM.
  • To identify factors limiting collection efficiency (CE) in the single-electron regime.
  • To investigate the impact of laser parameters and gun elements on CE.

Main Methods:

  • Utilized General Particle Tracer software for simulations.
  • Employed calculated field maps and the exact architecture of the Thermo Fisher/FEI Tecnai Femto UEM.
  • Simulated the effects of femtosecond laser parameters and key gun elements on CE.

Main Results:

  • Collection efficiency (CE) is highly dependent on laser spot size, Wehnelt aperture diameter, and photon energy.
  • CE dispersion with laser spot size varies significantly with aperture diameter.
  • A gun crossover was observed, with beam-waist position influenced by aperture diameter, indicating its role as an electrostatic lens.

Conclusions:

  • The Wehnelt aperture functions as a fixed electrostatic lens in UEM mode.
  • Optimizing laser spot size and aperture diameter is critical for enhancing CE in femtosecond 4D UEM.
  • This research provides valuable operational insights for femtosecond 4D UEM systems.