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Use of the quasi‐classical approximation for projected potential calculation in HREM image simulation
Author(s) -
TANG D.,
DORIGNAC D.
Publication year - 1995
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1995.tb03632.x
Subject(s) - born approximation , fourier transform , electron , crystal (programming language) , physics , electron scattering , amplitude , wave function , scattering , quantum mechanics , computational physics , computer science , programming language
SUMMARY A new method for high‐resolution electron microscope image simulation using the multislice approach is proposed: the calculation of the two‐dimensional projected potential of a crystal is performed directly in real space, from tabulated atomic potentials based on the relativistic Hartree–Fock–Slater model and following the quantum mechanical quasi‐classical approximation. The validity of the approximation is carefully examined by estimating the electron wave phase shift due to the crystal potential. The results are compared with those given by the conventional method, for which the projected potential is obtained by Fourier transforming the first Born electron scattering amplitudes.