Iron-free objective lenses II
Department of Physics, Assiut University, Assiut, Egypt
Corresponding author: firstname.lastname@example.org
Accepted: 20 October 2001
Published online: 15 March 2002
The main factors limit the field of the magnetic lenses are the current density σ and the accelerating voltage Vr. Optical properties such as chromatic and spherical aberration have been studied in terms of σ and Vr. Values of the other aberration coefficients for the optimum lens size corresponding to the desired minimum aberration are estimated.
PACS: 41 – Electromagnetism; electron and ion optics
© EDP Sciences, 2002