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All-Optical Three-Dimensional Electron Momentum Imaging.

Emmanuel Orunesajo1, Gihan Basnayake1, Yasashri Ranathunga1

  • 1Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.

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We developed a new 3D electron momentum imaging system using a fast scintillator and silicon photomultiplier tube (siPMT). This method achieves high time resolution and significantly reduces dead time for detecting multiple electrons.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Particle Detection Technology
  • Spectroscopy

Background:

  • Accurate three-dimensional (3D) electron momentum imaging is crucial for understanding electron dynamics.
  • Conventional methods often face limitations in time resolution and dead time, especially for detecting multiple electrons.
  • Developing advanced detectors is essential for improving the precision and efficiency of electron imaging.

Purpose of the Study:

  • To introduce a novel implementation of 3D electron momentum imaging.
  • To enhance the time resolution and reduce dead time in electron detection systems.
  • To demonstrate the capability of the new system for precise electron trajectory analysis.

Main Methods:

  • Utilized a two-dimensional (2D) imaging detector coupled with a silicon photomultiplier tube (siPMT).
  • Incorporated a poly(p-phenylene)-dye-based fast scintillator (Exalite 404) for improved time resolution.
  • Implemented a time-of-flight measurement technique for electron momentum reconstruction.

Main Results:

  • Achieved an electron time-of-flight resolution comparable to established electrical MCP pick-off methods (tens of picoseconds).
  • Demonstrated a significant reduction in dead time to approximately 0.48 nanoseconds when detecting coincident electrons.
  • Successfully implemented 3D momentum imaging with enhanced temporal accuracy.

Conclusions:

  • The new 3D electron momentum imaging system offers high performance in terms of time resolution and dead time.
  • The use of fast scintillators and siPMTs presents a promising advancement in electron detection technology.
  • This implementation provides a valuable tool for advanced studies in atomic physics and related fields.