Surface resonances and the oxidation of single-crystal aluminum

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Valence-band photoemission spectra have been studied on single-crystal aluminum faces using polarized sychrotron radiation. New intrinsic and oxygen-related extrinsic surface resonance features are observed within 5 eV of the Fermi level. These surface resonances are correlated with oxygen uptake on the (100), (110), and (111) faces as observed in both valence and core-level spectroscopy. Considerable face dependence to the oxidation is shown. Although aluminum is a free-electron-like metal, its surface behavior on single-crystal faces shows effects due to localized charge.