We describe the principle of a new electron spectrometer combining a magnetic torroidal deflector and a simple electrostatic focuser. The electrons are dispersed according to their energy and polar angle, along two orthogonal axes of a plane detector. This bidimensional (E, θ) display is very convenient for band-structure studies and for rapid acquisition of the data.
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Gaëtan Lévêque (1986) studied this question.
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