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We report the results of our studies of ruthenium layer structures adsorbed on GaN(0001). Ruthenium was evaporated at room temperature under ultrahigh vacuum conditions onto n-type GaN substrates epitaxially grown on sapphire. While X-ray photoelectron spectroscopy confirmed the presence of Ru bonds in the deposited adlayers, the ultraviolet photoelectron spectroscopy show a peak at the Fermi level...
The electronic structure of n-type GaN(0001) surface and its modification by N⁺ ion bombardment are presented in this report. The studies were carried out in situ in ultrahigh vacuum by ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and low-energy electron diffraction. Low-energy N⁺ ion bombardment, which was done using an ion gun at an energy of 200 eV, leads to nitriding...
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