Sources of Internal Scattering of Electrons in a Cylindrical Mirror Analyser (CMA)
Sources of Internal Scattering of Electrons in a Cylindrical Mirror Analyser (CMA)
复制标题
柱面镜分析仪 (CMA) 中电子内部散射的来源
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
T. A. E. Bakush
中科院分区：
文献类型：
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作者：
M. Gomati;T. A. E. Bakush
在单通瓦里安柱面镜分析器（CMA）的电子的内部散射的一些可能的来源已被确定和它们的相对贡献的电子光谱背景的评价。这些来源包括：外圆筒的内表面;内圆筒的输入和输出孔;两个圆筒之间的场修整器;电子检测器前面的出口孔的壁;内圆筒的外表面。理论/实验比较上述来源已证实，其中最重要的两个是出口孔壁和场修整器。其他来源的贡献只是微不足道的总信号的内部散射电子。对光谱仪及其检测器的简单修改显示内部散射信号的大幅减少。一个简单的实验测量确定的各种内部散射源的相对贡献的建议。建议用这种测量代替常用的峰背景比作为诊断工具，用于检测和评估CMA中电子内部散射的所有上述来源。
A number of possible sources of internal scattering of electrons in a single-pass Varian cylindrical mirror analyser (CMA) have been identified and their relative contributions to the electron spectral background evaluated. These sources include : the inner surfaces of the outer cylinder ; the input and output apertures of the inner cylinder ; the field trimmers between the two cylinders ; the walls of the exit aperture in front of the electron detector ; the outer surfaces of the inner cylinder. A theory/experiment comparison of the above sources has verified that the two most significant of these are the walls of the exit aperture and the field trimmers. The other sources contribute only negligibly to the total signal of internally scattered electrons. Simple modifications of the spectrometer and its detector show a large reduction in the internal scattering signal. A simple experimental measurement for determining the relative contribution of the various internal scattering sources is suggested. This measurement is recommended instead of the commonly used peak-to-background ratios as a diagnostic tool for detecting and evaluating all the above-mentioned sources of internal scattering of electrons in a CMA.