Abstract
We present experimental and ab initio theoretical determination of the dynamics of valence electrons in potassium by investigating the dynamical structure factor at nonvanishing momentum transfers. The spectra show large deviations from a jellium-type behavior due to the presence of $d$-type states above the Fermi level. In particular, we identify two well-defined interband excitations that have a direct correspondence with the density of states above the Fermi level.
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