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Composition of a Clean and Sulphur Covered CuNi(100) Single Crystal Surface

100%
Godowski P. J., Marcus P.
Acta Physica Polonica A
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1995
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vol. 87
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issue 3
619-630
EN
Surface composition of the CuNi(100) single crystal in the temperature range of 893÷1073 K (620÷800°C) has been investigated using low energy electron diffraction and Auger electron spectroscopy methods. A clean sam­ple surface at moderate temperatures reveals small surface copper enrich­ment, with respect to the bulk Cu-rich composition. For example, at 1006 K (733°C) the copper surface concentration C^{s}_{Cu}, was determined from the quantitative Auger electron spectroscopy analysis as 0.91. After prolonged heating at higher temperatures, the copper surface concentration converges to the bulk value, i.e. at 1073 K (800°C), C^{s}_{Cu} = C^{b}_{Cu} = 0.87. Surface seg­regation of sulphur proceeds from (1 × 1) through p(2 × 2)S/CuNi(100) to c(2 × 2)S/CuNi(100) structures of low energy electron diffraction. In the presence of segregated sulphur the surface concentration of copper is lower.
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CO-Induced Photoemission Structures of the CO/Pt/Ru(0001) Interface

81%
Godowski P. J., Onsgaard J., Li Z.
Acta Physica Polonica A
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2016
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vol. 130
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issue 6
1389-1394
EN
The CO/Pt/Ru(0001) interface has been re-examined, in great detail, by photoelectron spectroscopy of high resolution under UHV conditions. The Ru(0001) substrate has been modified by platinum at coverages less than corresponding to the one, saturated, Pt overlayer, with no Pt/Ru intermixing. The analysis of the extent to which different regions of the photoelectron spectrum allow a detailed characterization of the interface is presented. The CO adsorption displays interaction with two separate phases: the Pt(111) face and the Ru(0001) surface.
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