Abstract
A new electron spectrometer for kinetic energies below 100 eV is presented. It uses the time-of-flight technique and combines high resolution with high luminosity. A permanent magnet with soft iron pole pieces generates a rotationally symmetric magnetic field with 1 r 2 dependence. This field makes it possible to confine very long real flight paths within small physical dimensions. The analyzer has an overall diameter of about 0.3 m and the use of an iron magnet makes it practically insensitive to external magnetic fields. Electronic equipment for pulsing and detection is described. A transmission measurement of the 1s2s 2 resonance in He − is used to test the performance of the spectrometer.
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