Faculté des sciences

Direct structure determination of a composite double-layer surface alloy by x-ray photoelectron diffraction: p (2×2)-Na/Al(111)

Fasel, Roman ; Aebi, Philipp ; Schlapbach, Louis ; Osterwalder, Jürg

In: Physical Review B, 1995, vol. 52, no. 4, p. R2313-R2316

The local structure of p(2×2)-Na/Al(111) has been investigated using angle-scanned full hemispherical x-ray photoelectron diffraction. The resulting diffraction patterns allow a direct and unequivocal determination of the surface atomic structure. Even though Na and Al are completely immiscible in the bulk, the p(2×2)-Na/Al(111) phase consists of a composite double-layer... Plus

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    Summary
    The local structure of p(2×2)-Na/Al(111) has been investigated using angle-scanned full hemispherical x-ray photoelectron diffraction. The resulting diffraction patterns allow a direct and unequivocal determination of the surface atomic structure. Even though Na and Al are completely immiscible in the bulk, the p(2×2)-Na/Al(111) phase consists of a composite double-layer surface alloy where Na atoms take substitutional and fcc hollow sites and Al atoms removed from the surface occupy hcp hollow sites.