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The angular dependence of the external photoemission is calculated for a free-electron-like metal. Numerical examples are given for sodium. Electrons which leave the solid without scattering have a very anisotropic spatial distribution: The intensity dId has discontinuities caused by the sharpness of the Fermi surface. These distributions can be used to determine the band structure of the metal.
G. D. Mahan (Mon,) studied this question.
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