Article
Theoretical Estimates of Spherical and Chromatic Aberration in Photoemission Electron Microscopy
Ultramicroscopy
(2016)
Abstract
We present theoretical estimates of the mean coefficients of spherical and chromatic aberration for low energy photoemission electron microscopy (PEEM). Using simple analytic models, we find that the aberration coefficients depend primarily on the difference between the photon energy and the photoemission threshold, as expected. However, the shape of the photoelectron spectral distribution impacts the coefficients by up to 30%. These estimates should allow more precise correction of aberration in PEEM in experimental situations where the aberration coefficients and precise electron energy distribution cannot be readily measured.
Disciplines
Publication Date
January, 2016
DOI
10.1016/j.ultramic.2015.10.023
Publisher Statement
Copyright 2015 Elsevier B.V. All rights reserved.
Citation Information
Joseph P.S. Fitzgerald, Rolf Kӧnenkamp and Robert Campbell Word. "Theoretical Estimates of Spherical and Chromatic Aberration in Photoemission Electron Microscopy" Ultramicroscopy Vol. 160 (2016) p. 252 - 255 Available at: http://works.bepress.com/rolf_koenenkamp/18/