Observation of a localized surface phonon on an oxide surface

Wolter, Kai; Scarano, D; Fritsch, J; Kuhlenbeck, Helmut; Zecchina, A; Freund, Hans-Joachim

doi:10.1016/S0009-2614(00)00233-5

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Observation of a localized surface phonon on an oxide surface

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Wolter, Kai
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Kuhlenbeck, Helmut
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund, Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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引用

Wolter, K., Scarano, D., Fritsch, J., Kuhlenbeck, H., Zecchina, A., & Freund, H.-J. (2000). Observation of a localized surface phonon on an oxide surface. Chemical Physics Letters, 320(1-2), 206-211. doi:10.1016/S0009-2614(00)00233-5.

引用: https://hdl.handle.net/21.11116/0000-000D-9035-4

要旨

The vibration modes of a clean Cr₂O₃(0001) surface have been studied under ultra high vacuum conditions with high-resolution electron energy loss spectroscopy. A mode which is confined to the first few atomic layers of the oxide was detected in addition to the Fuchs–Kliewer phonons. In contrast to the Fuchs–Kliewer phonons which extend deeply into the bulk, this mode is very sensitive towards the presence of adsorbates. Full-potential linearized augmented plane-wave calculations show that this mode is an in-phase oscillation of the second-layer oxygen atoms and the Cr atoms of the two layers below.