On the Darwin--Howie--Whelan equations for the scattering of fast electrons described by the Schrödinger equation

The Darwin-Howie-Whelan equations are commonly used to describe and simulate the scattering of fast electrons in transmission electron microscopy. They are a system of infinitely many envelope functions, derived from the Schrödinger equation. However, for the simulation of images only a finite set of envelope functions is used, leading to a system of ordinary differential equations in thickness direction of the specimen. We study the mathematical structure of this system and provide error estimates to evaluate the accuracy of special approximations, like the two-beam and the systematic-row approximation.

Keywords

Transmission electron microscopy, electronic Schrödinger equation, elastic scattering, Ewald sphere, dual lattice, Hamiltonian systems, error estimates

URI

https://oa.tib.eu/renate/handle/123456789/9451
https://doi.org/10.34657/8489

Citation

Koprucki, T., Maltsi, A., & Mielke, A. (2020). On the Darwin--Howie--Whelan equations for the scattering of fast electrons described by the Schrödinger equation (Vol. 2801). Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik. https://doi.org//10.20347/WIAS.PREPRINT.2801

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Mathematik

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