The unoccupied electronic states located above the vacuum level of CuO and Cu2O have been studied by means of the secondary electron emission technique up to 50 eV above the Fermi level. The results of our measurements have been compared with bremsstrahlung isochromat data and with the calculated unoccupied density of states taken from the literature. All the features within 15 eV of the Fermi level coincide with structures of the unoccupied density of states. A relaxation mechanism involving O3d empty levels and O2s core levels has been found to occur in CuO but not in Cu2O, very probably because of the different strengths of the bonding between oxygen and copper. The predicted Cu4d empty states of Cu2O have also been observed.
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|Titolo:||Unoccupied electronic states of CuO and Cu2O studied by secondary electron emission|
|Data di pubblicazione:||1994|
|Appare nelle tipologie:||1.1 Articolo in rivista|