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(0 0 1): a MDS study
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
Growth and oxidation of Na on Ag(0 0 1): a MDS study
چکیده انگلیسی
Growth and oxidation of Na adlayers on Ag(0 0 1) have been investigated by means of metastable de-excitation spectroscopy (MDS) and He reflectivity (RHe) measurements. During Na deposition at 180 K, RHe exhibits maxima at the formation of the c(2 × 2)-Na phase and at the completion of the first layer. Oxidation of the Na film at 180 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 400 K and finally to the removal of the Na-O film at 750 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 2.5 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 1–4, April 2005, Pages 351-355
نویسندگان
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