کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9818304 | 1518778 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Growth and oxidation of Na on Ag(0Â 0Â 1): a MDS study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
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چکیده انگلیسی
Growth and oxidation of Na adlayers on Ag(0Â 0Â 1) have been investigated by means of metastable de-excitation spectroscopy (MDS) and He reflectivity (RHe) measurements. During Na deposition at 180Â K, RHe exhibits maxima at the formation of the c(2Â ÃÂ 2)-Na phase and at the completion of the first layer. Oxidation of the Na film at 180Â K by exposure to O2 goes through the incorporation of dimeric molecular ions and, at larger exposure, of neutral O2 molecules. Successive annealing of the oxidised Na film leads first to the loss of the neutral oxygen molecules at 400Â K and finally to the removal of the Na-O film at 750Â K. Both Na condensation and oxidation of the Na film induce the lowering of the work function. In both cases (Na deposition and oxidation), the singlet-to-triplet conversion was found to be hindered if the work function is lower than 2.5Â eV.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 230, Issues 1â4, April 2005, Pages 351-355
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 230, Issues 1â4, April 2005, Pages 351-355
نویسندگان
R. Moroni, M. Canepa, S. Terreni, L. Mattera,