کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1684204 1518749 2010 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stopping power of GaAs for swift protons: Dielectric function and optical-data model calculations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
Stopping power of GaAs for swift protons: Dielectric function and optical-data model calculations
چکیده انگلیسی
The energy-loss-function (ELF) of GaAs determined from optical data has been used to calculate the electronic stopping power (SP) of swift protons in the Born approximation. Along the lines of the Ritchie-Howie scheme, a sum of Drude-type ELFs with finite damping was used to obtain an analytic representation of the experimental data at the optical limit of zero momentum transfer. Consistency was ensured by satisfying both the KK- and f-sum-rule to better than 1%. The mean excitation energy (I-value) of GaAs was calculated at 349 eV which is about 3% higher than the recent estimate of Heredia-Avalos and co-workers [S. Heredia-Avalos, J.C. Moreno-Marin, I. Abril, R. Garcia-Molina, Nucl. Inst. Meth. B 230 (2005) 118]. A simple quadratic dispersion relation used to extend the ELF to arbitrary momentum transfers was found adequate for SP calculations above ∼300 keV where our results are in good agreement with the available experimental data and other sources in the literature. The limitation of the present scheme at lower proton energies is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 268, Issues 11–12, June 2010, Pages 1723-1726
نویسندگان
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