  This work reports about bulk-sensitive, high energy photoelectron
spectroscopy from the valence band of CoTiSb excited by photons from 1.2 to 5
keV energy. The high energy photoelectron spectra were taken at the KMC-1 high
energy beamline of BESSY II employing the recently developed Phoibos 225 HV
analyser. The measurements show a good agreement to calculations of the
electronic structure using the LDA scheme. It is shown that the high energy
spectra reveal the bulk electronic structure better compared to low energy XPS
spectra.
