ON SOME MODIFICATION OF THE MO(011) SURFACE ELECTRONIC-STRUCTURE BY AN OXIDE MONOLAYER

Electron energy loss spectroscopy (EELS) has been used to investigate the electron interband transitions in a (011)Mo crystal covered by an oxygen monolayer. The paper continues the presentation of experiments in which the authors try to verify surface-localized electronic struct ures. In the case of clean (011)Mo studied in our previous paper we ha d applied the inelastic low energy diffraction effects in EELS analysi s due to a well defined crystal structure of the surface. The effects increase the signal to noise ratio and thus the inter-band transitions can be detected at primary electron energies below 100 eV. It has bee n found that the EEL spectra measured for the oxidized (011)Mo plane a nd measured for the clean surface at E(p) = 45 eV show significant dif ferences from each other. A theoretical simulation of the EEL spectrum based on the density-of-states function published by other authors fo r molybdenum oxide shows a qualitative agreement with the experimental result.