کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9818086 1518776 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
He+ scattering on clean and oxygen covered Al(1 1 1)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
He+ scattering on clean and oxygen covered Al(1 1 1)
چکیده انگلیسی
We present results of a study of He+ neutralisation on clean and oxygen covered Al(1 1 1). For clean Al(1 1 1) we find a small ion fraction which rapidly increases with increasing ion energy attaining about (0.4 ± 0.1)% at 4 keV. The overall behaviour is quite different from that observed on previously studied Ag surfaces and is attributed to reionisation processes, a conclusion supported by measurements using He atoms. When O2 is adsorbed onto Al(1 1 1) at room temperature, we observe a rapid increase in the ion fraction, which attains a broad plateau for exposures higher than about 50 L. Experiments with incident He atoms lead to an ion fraction that is smaller, indicating that in this case a substantial fraction of ions is due to survival of incident ions. We attribute these changes to a decrease of the Auger neutralisation rates on the oxidic surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 232, Issues 1–4, May 2005, Pages 27-31
نویسندگان
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