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Variable-deceleration-ratio wide-acceptance-angle electrostatic lens for two-dimensional angular and energy analysis.

Hiroyuki Matsuda1, László Tóth2, Hiroshi Daimon1

  • 1Division of Materials Science, Graduate School of Science and Technology, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.

The Review of Scientific Instruments
|January 3, 2019
PubMed
Summary
This summary is machine-generated.

A novel electrostatic lens, the Variable-Deceleration-Ratio Wide-Acceptance-Angle Electrostatic Lens (VD-WAAEL), enables 2D angular and energy analysis with a ±50° acceptance angle. Its simple projection lens design achieves an energy resolution of approximately 1/1000.

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Area of Science:

  • Physics
  • Electrostatic Optics
  • Electron Spectroscopy

Background:

  • Accurate two-dimensional (2D) angular and energy analysis is crucial for understanding electron behavior.
  • Existing electrostatic lens designs often have limitations in acceptance angle or resolution.

Purpose of the Study:

  • To propose and investigate the Variable-Deceleration-Ratio Wide-Acceptance-Angle Electrostatic Lens (VD-WAAEL) for 2D angular and energy analysis.
  • To evaluate the performance and potential applications of the VD-WAAEL.

Main Methods:

  • Utilized charge simulation method for fundamental lens feature analysis.
  • Employed ray tracing calculations to simulate electron trajectories.
  • Investigated the impact of mesh electrode properties on performance.

Main Results:

  • The VD-WAAEL features an ellipsoidal mesh electrode enabling a wide acceptance angle of ±50°.
  • A simple VD-WAAEL-projection-lens configuration with an aperture achieves energy analysis.
  • Ray tracing calculations, considering mesh hole effects, indicate a potential energy resolution of ~1/1000 for the simple analyzer.

Conclusions:

  • The VD-WAAEL is a promising technique for 2D angular and energy analysis.
  • The simple VD-WAAEL-projection-lens analyzer offers a practical approach with good acceptance angle and moderate energy resolution.
  • Further refinement with fine mesh electrodes is recommended to mitigate mesh hole disturbances and optimize resolution.