Screening effects in the KLV Auger spectra of Na, Mg, Al, and Si

X-ray excited KL₁V and KL2,3V Auger spectra of clean Na, Mg, Al, and Si are presented. The influence of core holes on the shape of the valence band is made evident by comparison with x-ray photoelectron spectroscopy and x-ray emission spectra. It is shown that such Auger spectra give experimental evidence on the local and symmetry-selected density of states around a core hole. The local density of s states is more affected by core ionization than the local density of p states.