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- W2004244611 abstract "We have studied the location of Pb atoms on Cu(100) at submonolayer coverages using a few hundred keV He+ ion beams in channeling experiments under single- and double-alignment geometry. Different shadowing effects of Pb on Cu are experimentally observed according to the structure of the deposit, which was evidenced by LEED (in particular the c(5√2 × √2)R45° and c(2 × 2) structures). These effects disappear around the melting temperature of the structures. For a Pb coverage of θ ≈ 0.5, when a c(2 × 2) structure is formed, the distance dPb between the Pb plane and the first (100) Cu plane, measured under double alignment geometry (channeling along [100], blocking along [110] 45° off the normal to the surface), is dPb = 2.05 ± 0.05 Å. We also find that the Pb atoms induce a static disorder in the first Cu surface plane. This disorder may be described by isotropic Gaussian displacements of Cu atoms, with a one-dimensional projected RMS deviation ud of around 0.12 Å. It depends little on the Pb structure: in particular, there is no specific disordering in the alloyed state corresponding to low Pb coverages. From this observation, we deduce that for low coverage, the Pb atoms lie about 1 Å above the first Cu plane." @default.
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- W2004244611 date "1996-09-01" @default.
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- W2004244611 title "A channeling study of lead submonolayers deposited onto Cu(100)" @default.
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- W2004244611 doi "https://doi.org/10.1016/0039-6028(96)00717-0" @default.
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