Journal
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
Volume 163, Issue 1-3, Pages 28-39Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.elspec.2008.02.001
Keywords
electron spectroscopy; ESCA; hemispherical analyser; paracentric hemispherical analyser; fringing fields
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Using the basic spectrometer trajectory equation for motion in an ideal 1/r potential derived in Eq. (101) of part I [T.J.M. Zouros, E.P. Benis, J. Electron Spectrosc. Relat. Phenom. 125 (2002) 221], the operational characteristics of a hemispherical deflector analyser (HDA) such as dispersion, energy resolution, energy calibration, input lens magnification and energy acceptance window are investigated from first principles. These characteristics are studied as a function of the entry point R-0 and the nominal value of the potential V(R-0) at entry. Electron-optics simulations and actual laboratory measurements are compared to our theoretical results for an ideal biased paracentric HDA using a four-element zoom lens and a two-dimensional position sensitive detector (2D-PSD). These results should be of particular interest to users of modem HDAs utilizing a PSD. (C) 2008 Elsevier B.V. All rights reserved.
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