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Cathode Lense in LEED Author: Ching-song Shern

Abstract：

Low-energy electron diffraction (LEED) is a powerful tool of surface topo-graphy and surface structure investigations. The methods to calculate potential distribution and to trace the trajectories of electrons in the electrostatic cathode lense of LEED are discussed. Computer program to calculate the potential distri-bution with a nine-point network relaxation method and to trace the trajectories of electrons by a general equation of motion in the whole space of the system are available. The second focal length of the lense is independent of the incident kinetic energy of the electron at the first order approximation. The spherical abberration of the system is also concerned.

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