Applied Physics
N 3, 2002

Calculation of electrostatic mirrors, free from spherical and axial chromatic aberrations

S.B. Bimurzaev, G.S. Serikbaeva, E.M. Yakushev
The Al-Faraby’s Kazakh State National University, Almaty, Republic of Kazakhstan

   The design formulas for coefficients of spherical and axial chromatic aberrations of an electrostatic electronic mirror of a rotational symmetry are deduced. The procedure of elimination from integrands of the high orders of derivatives from an axial potential distribution in reflecting systems is reduced. By numerical calculations the requirements of simultaneous elimination of spherical and axial chromatic aberrations in three and four-electrode electrostatic mirrors consisting of coaxial cylinders of equal diameter are defined. The principal diagram of a translucent electron microscope with the darkfield image, which has a lens as the electrostatic electronic mirror, is given.

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