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Title: A second-order focusing electrostatic toroidal electron spectrometer with 2π radian collection
Authors: Khursheed, A. 
Hoang, H.Q. 
Keywords: Auger electron spectroscopy
Electron energy spectrometers
Scanning electron microscope
Issue Date: Dec-2008
Citation: Khursheed, A., Hoang, H.Q. (2008-12). A second-order focusing electrostatic toroidal electron spectrometer with 2π radian collection. Ultramicroscopy 109 (1) : 104-110. ScholarBank@NUS Repository.
Abstract: This paper presents a toroidal electron energy spectrometer designed to capture electrons in the full 2π azimuthal angular direction while at the same time having second-order focusing optics. Simulation results based upon direct ray tracing predict that the relative energy resolution of the spectrometer will be 0.146% and 0.0188% at input angular spreads of ±6° and ±3°, respectively, comparable to the theoretically best resolution of the cylindrical mirror analyzer (CMA), and an order of magnitude better than existing toroidal spectrometers. Also predicted for the spectrometer is a parallel energy acquisition mode of operation, where the energy bandwidth is expected to be >±10% (20% total) of the pass energy. The spectrometer is designed to allow for retardation of the pass energy without the need to incorporate auxiliary lenses. © 2008 Elsevier B.V. All rights reserved.
Source Title: Ultramicroscopy
ISSN: 03043991
DOI: 10.1016/j.ultramic.2008.09.001
Appears in Collections:Staff Publications

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