کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8038249 1518331 2014 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analytical model of an isolated single-atom electron source
ترجمه فارسی عنوان
مدل تحلیلی یک منبع الکترون تک اتم جدا شده
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
چکیده انگلیسی
An analytical model of a single-atom electron source is presented, where electrons are created by near-threshold photoionization of an isolated atom. The model considers the classical dynamics of the electron just after the photon absorption, i.e. its motion in the potential of a singly charged ion and a uniform electric field used for acceleration. From closed expressions for the asymptotic transverse electron velocities and trajectories, the effective source temperature and the virtual source size can be calculated. The influence of the acceleration field strength and the ionization laser energy on these properties has been studied. With this model, a single-atom electron source with the optimum electron beam properties can be designed. Furthermore, we show that the model is also applicable to ionization of rubidium atoms, and thus also describes the ultracold electron source, which is based on photoionization of laser-cooled alkali atoms.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 147, December 2014, Pages 61-69
نویسندگان
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