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Simple concepts in the measurement of the energy distribution and spin polarization of an electron beam

Review of Scientific Instruments, ISSN: 0034-6748, Vol: 57, Issue: 6, Page: 1052-1060
1986
  • 16
    Citations
  • 0
    Usage
  • 4
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    16
    • Citation Indexes
      16
  • Captures
    4

Article Description

A comprehensive study of a compact electron spectrometer coupled with a Mott polarimeter is presented. This device is operated in ultrahigh vacuum (1×10 Torr) and optimized to investigate the polarized photoemission from negative electron affinity semiconductors. The electron energy dispersing device is made up of two 90° cylindrical electrostatic deflectors. It combines optimum geometry to allow spin-polarization measurements with high resolution (∼20 meV) and high luminosity (peak output current up to 5 nA). Emphasis is placed on practical hints, limiting factors, and simple criteria to optimize the design of the electron selector, the electron optics, the power supplies, and the current detection. The proposed solutions lead to a very convenient, easy to operate, and low-cost apparatus. Also the way of obtaining optimal performances is discussed. A new and simple method to measure the energy resolution of an electron spectrometer is described in detail. The problem of energy calibration is considered and some experimental results, obtained on gallium arsenide, are shown for illustration.

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