The interband optical conductivity of potassium has been calculated in the range 1-10 eV by a first-principles technique. Energy levels, wave functions, and matrix elements were obtained at 2470 inequivalent points in the Brillouin zone from a self-consistent calculation using the method of linear combinations of atomic orbitals. Good agreement with experiment was obtained. An explanation is given for the increased absorption observed in the 5-10-eV range.
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Ching et al. (1973) studied this question.
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