Abstract
The electronic structure of K0.9Mo6O17, which is a quasi-two-dimensional charge-density-wave (CDW) system, has been studied by ultraviolet photo-emission spectroscopy (UPS). Angle-integrated spectra were measured in the photon energy range from 32 to 100 eV at room temperature. A resonant enhancement of the Mo 4d states was observed around h nu =50 eV. This energy is much greater than the binding energy of the Mo 4p core level measured by photo-emission. The resonant effect for the structure at the binding energy EB=7.0 eV is appreciably stronger than that at EB=4.6 eV, which demonstrates that the Mo 4d orbitals are strongly hybridised with the O 2p orbitals at the deep binding energies in the valence bands. The angle-resolved UPS spectra were also measured at room temperature.
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