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Continued skirmishing on the wave-particle frontier.

A Howie1

  • 1Department of Physics, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, UK.

Ultramicroscopy
|February 18, 2019
PubMed
Summary

Electron microscopy integrates particle and wave electron theories for advanced imaging. Johnson noise in electron beams is linked to temperature and wavelength, requiring quantum mechanics for full understanding.

Keywords:
Induced bremmstrahlungJohnson noiseMagnetic spectrometerWave particle duality

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Area of Science:

  • Physics
  • Materials Science
  • Electron Microscopy

Background:

  • Electron microscopy's understanding bridges particle and wave electron theories.
  • Electron optics traditionally relies on particle models, but imaging increasingly uses wave methods.
  • Spectroscopy utilizes classical models for electron behavior and Johnson noise.

Purpose of the Study:

  • To review historical developments in electron microscopy.
  • To analyze the role of wave methods in modern electron imaging.
  • To investigate Johnson noise effects in electron spectroscopy and magnetic spectrometers.

Main Methods:

  • Review of historical electron microscopy literature.
  • Application of classical electron models (Fermi's model).
  • Analysis of Johnson noise effects on electron scattering and spectrometer performance.

Main Results:

  • Electron imaging performance is enhanced by wave-based methods.
  • Root-mean-square Johnson noise scattering is proportional to electron wavelength and temperature.
  • Johnson noise's influence on magnetic spectrometers requires quantum mechanical treatment.

Conclusions:

  • Wave methods are crucial for advancing electron microscopy.
  • Classical models explain basic Johnson noise but have limitations.
  • Quantum mechanics is necessary to fully understand Johnson noise in electron spectrometers.