کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1570980 | 1514394 | 2014 | 8 صفحه PDF | دانلود رایگان |
• We examined the structure and surface termination of fcc and hcp monocrystals.
• Crystalline structure within the first few atomic layers was determined by DEPES.
• Multiple scattering formalism was used to obtain theoretical results.
• Populations of terraces with different terminations were determined.
• Scattering parameters are discussed in the context of computation time optimization.
Experimental and theoretical details concerning the directional elastic peak electron spectroscopy are presented. The application of this experimental method to the identification of a crystalline structure of surface layers is shown for Cu(111) and Ru(0001), which enables the analysis of different surface terminations associated with different sequences of atoms along the surface normal. Theoretical data are obtained by applying the multiple scattering theory and different sources of phase shifts. The quantitative analysis performed by an R-factor reveals almost the same populations of A and B terminated (0001) terraces and proves explicitly the presence of steps of atomic height on the clean Ru(0001) surface. This is not the case for the Cu(111) surface, where the terrace termination does not affect the distribution of atomic directions within the first few atomic layers. The averaging of theoretical data versus scattering volume defined by the sphere radius Rmax around the emitter site is discussed in view of the computation time optimization.
Journal: Materials Characterization - Volume 93, July 2014, Pages 94–101