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The energy distribution of oxygen 2p states is studied at the Cu/MgO(100) interface in a zone of 1.5 nm buried under a 10 nm thick copper film. Occupied oxygen states are evidenced in the MgO band gap. The results are deduced from an analysis of the O 1s–2p emission induced by an electron beam. With such probe particles, the ionization of the O 1s hole is produced selectively in the depth, making possible the O 1s–2p emission in a chosen thickness located at the interface. Only the p states whose wave functions overlap the O 1s wave function are involved in the emission. This condition gives a local character to the experimental method and, consequently, the states seen in the band gap are characteristic of oxygen. |
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