The Electron Optics of the Cylindrical Deflector
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The basic properties of the cylindrical deflector as an electron dispersive device are discussed in this chapter. It is shown that cylindrical deflectors terminated by equipotential plates have no disadvantages compared to an ideal field termination when the deflection angle is properly adjusted. Cylindrical deflectors can also be used as retarding devices, which allows a stepwise monochromati-sation of a beam, without intermediate lenses for retardation. The transmission of electron dispersive systems is related to the angular aberration. The concept of “dispersion compensated” spectrometers and the reasons for their failure in practice are investigated.
KeywordsDeflection Angle Transmission Function Entrance Slit Entrance Angle Exit Slit
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