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- W2062684805 abstract "Abstract The effect of adsorbed ordered and disordered overlayers on the specular reflectivity, I 00 , of low-energy electrons (0–30 eV) normally incident on Ni(001) has been investigated. In particular the energy region close to the vacuum-level where Ni has an energy gap about 7 eV wide was explored. The clean Ni(001) surface is strongly reflecting in this region ( I 00 ≈ 0.30). It is shown that I 00 changes drastically over the energy gap when an overlayer of Na, K, Cs, or Ba is present on the surface. The ordered overlayers give rise to new sharp structure in I 00 related to emergence and strong tertiary scattering of the new non-integer order, non-specular beams while the disordered overlayers affect I 00 in a rather smooth way interpreted to be due to incoherent scattering in the overlayer. A simple one-dimen-sional scattering model is presented, where the incoherently scattering, disordered over layer is treated as a purely imaginary square well at a distance d from the first Ni-layer. The scattering properties of the Ni-crystal in the [001] direction is solved by a two-beam treatment in the nearly free electron approximation. The model calculations are shown to reproduce the experimental I 00 curves well over the range of the energy gap. It is also shown that the d -value, i.e. the overlayer-substrate distance can be determined if the average potential in the region between the overlayer and substrate is known. Guided by electron gas results this potential has been roughly approximated by a step 3 eV above the bottom of the nickel conduction band. The following d -values are then obtained; d Na = 2.90 A , d Ba = 2.95 A , d K = 3.55 A , and d Cs = 3.80 A . These values correla most interesting way with the geometrical d 's one arrives at by billiard-ball packing the adatoms over four Ni atoms (using atom radii for the bulk materials); d Na = 2.55 A , d Ba = 2.93 A , d K = 3.09 A , and d Cs = 3.45 A ." @default.
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- W2062684805 date "1972-07-01" @default.
- W2062684805 modified "2023-09-24" @default.
- W2062684805 title "Interpretation of specular electron reflectivities from disordered overlayers of Na, K, Cs, and Ba on Ni(001)" @default.
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- W2062684805 doi "https://doi.org/10.1016/0039-6028(72)90121-5" @default.
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