کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5424393 1395822 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Valence changes of Sm atoms adsorbed on Mo (2 1 1) surface
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Valence changes of Sm atoms adsorbed on Mo (2 1 1) surface
چکیده انگلیسی
Adsorption of Sm thin layers on the Mo (2 1 1) face was investigated by using Auger electron spectroscopy (AES), low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), X-ray photoemission spectroscopy (XPS) and changes of the work function measurements (Δϕ). The layer growth mode and the valence change of Sm atoms were determined. The Sm layer growth mode is layer-by-layer, at least to 3 ML, followed by the crystallite growth. It was found out that for θ < 0.3 ML Sm atoms are adsorbed only in divalent state. At coverage about 0.5 ML the number of both trivalent and divalent atoms is comparable. At θ = 1 ML, 11% of Sm atoms are divalent, and 89% trivalent. The second layer is composed of only divalent atoms. The first two layers have different surface densities, namely 6.15 × 1014 atoms/cm2 for the first layer, and 5.56 × 1014 atoms/cm2 for the second. Divalent Sm atoms creating the second layer form islands with the p(3 × 1) structure observed by LEED and STM.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 602, Issue 24, 15 December 2008, Pages 3721-3727
نویسندگان
, ,