Landolt-Börnstein - Group III Condensed Matter

6.2.1.3 EEL-spectrometer designs

Abstract

This chapter discusses electron energy loss (EEL)-spectrometer designs and inelastic cross section. To produce monoenergetic beams of electrons, electrostatic deflecting devices are generally used. Various designs of the monochromator and of the analyzer were proposed over the years based on the focusing properties of cylindrical mirror analyzers (CMA), spherical deflector analyzers (SDA) or cylindrical deflector analyzers (CDA) as illustrated. Double pass CDA EEL-spectrometer and EEL-spectrometer with parallel detection are shown. The monochromator selects the electrons inside of a given energy range from those emitted by a thermoionic source (normally a tungsten hairpin cathode or a LaB6 single crystal). The spot diameter is compared with an area of 0.3 ×3 mm2 illuminated by the electron beam generated by a CDA spectrometer is shown. Schematic design of a spin polarized EELS is illustrated. Magnetic properties were studied with a spin polarized beam produced by substituting the thermo-ionic cathode with a GaAsP crystal as shown. Alternatively EEL-spectrometers may be constructed according to the principle of dispersion compensation. This design is aimed to provide high currents for time resolved studies. The description of the inelastic scattering process requires addressing the nature of the interaction between the incoming electron and the surface.

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Title
6.2.1.3 EEL-spectrometer designs
Book Title
Interaction of Charged Particles and Atoms with Surfaces
In
6.2.1 Introduction
Book DOI
10.1007/b87125
Chapter DOI
10.1007/10086066_29
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
24C
Editors
  • G. Chiarotti
  • Authors
  • M. Rocca
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