کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8040881 1518665 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamic screening of an ion in a degenerate electron gas within the second-order Born approximation
ترجمه فارسی عنوان
غربالگری پویا یک یون در یک گاز الکترون انحطاط در تقریبی متقابل مرتبه دوم
کلمات کلیدی
قانون مجموع پویای فریدل، تقریبی متولد شد تئوری پراکندگی، گاز الکترون احیانا،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
چکیده انگلیسی
The dynamic Friedel sum rule (FSR) is derived within the second-order Born (B2) approximation for an ion that moves in a fully degenerate electron gas and for an arbitrary spherically-symmetric electron-ion interaction potential. This results in an implicit equation for the dynamic B2 screening parameter which depends on the ion atomic number Z1 unlike the first-order Born (B1) dynamic screening parameter reported earlier by some authors. Furthermore, for typical metallic densities our analytical results for the Yukawa and hydrogenic potentials are compared, for both positive and negative ions, to the exact screening parameters calculated self-consistently by imposing the exact dynamic FSR requirement to the scattering phase shifts. The B1 and B2 screening parameters agree excellently with the exact values at large velocities, while at moderate and low velocities the B1 approximation deviates from the exact solution whereas the B2 approximation still remains close to it. In addition, a Padé approximant to the Born series yields a further improvement of the perturbative approach, showing an excellent agreement on the whole velocity range in the case of antiprotons.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 354, 1 July 2015, Pages 167-171
نویسندگان
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