Electronic structure of ABO3perovskites: Esca experiments and band structure for BaTiO3, KNbO3and KTaO3

Abstract
In recent works,1–3 the x-ray photoelectron spectroscopy (XPS) has been used to determine the density of occupied states (DOS) in ABO3 ferroelectrics and a meaningful comparison can be made between DOS histograms obtained from band structure computation4–8 and XPS spectra.