The properties of the angle resolved photoemission spectra from nearly free electron (NFE) metals have been investigated for a wide range of electron densities, from K (1.4 × 10 22 electrons/cm 3 ) through Be (24.7 × 10 22 electrons/cm 3 ). These data are used in conjunction with theoretical calculations to illustrate the importance of many body effects in the excitation spectra. Characteristic features of the emission from the bulk and surface of NFE metals will be described as well as the possibility for interference between the emission from the bulk and surface.
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E. W. Plummer (1987) studied this question.
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