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Measurements of X-ray photoemission from magnesium hydride MgH, were made in an effort to further the fundamental understanding of the electronic structure of this metal hydride. The polycrystalline MgH, was compressed onto a metal holder to provide a smooth solid surface in a dry nitrogen box and then transferred into a ESCA system without exposure to air. Measurements were made immediately after the surface was scrapped in the vacuum. The binding energies of the photoelectrons from Mg 2s and 2p states were found to be 88.9 0.2eV and 50.1 0.2eV, respectively. The valence band spectrum shows an effective base width of approximately 8.8 eV, which is in reasonable agreement with the recent band structure calculation for MgH, , The photoelectron spectra also display features that can be identified as volume plasmon energy loss of 14.6 0.2eV. The data can be shown to be useful in calculating the average band gap energy (5.80eV) for MgH,.

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Articles you may be interested in ''Charge transfer in metal/polymer contacts and the validity of contact charge spectroscopy''A new model of contact charging based on the change of interfacial dipole energy is proposed. The model can be used to explain the charge exchange between an insulating polymer and a metal with a thin interfacial oxide layer. The energy shift of the polymeric electronic states relative to the metal Fermi level can be associated with the change in interfacial dipole energy. The calculated change in energy for polyethylene in contact with oxidized aluminum is found to be in good agreement with data from photoemission experiments. The results are shown to be useful in improving the existing models for calculating the magnitude of the charge exchange.