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A high resolution spectrometer for use at ultrahigh vacuum conditions has been designed. It is used in studies of low energy electrons (5-20 eV) photoemitted from clean surfaces. The analyser is of the hemispherical type with a mean radius of curvature for the electrons of 25 mm. All surfaces seen by the free electrons are made of copper. The electron detector is a channeltron used in the pulse counting mode. The analyser yields a resolution of 30 meV full width at half maximum at 10 eV as tested on water vapour samples. The analyser is rotatable around the sample enabling studies to be made of the angular distribution of the photoemitted electrons. Such curves from copper single crystals are presented.
Lindau et al. (Wed,) studied this question.
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