This paper reviews the methods of numerically computing the values of fast-electron diffraction amplitudes. The procedures for accurate use of these methods are discussed in detail. Particular attention has been given to the two theories of electron diffraction that are most readily applied to numerical evaluation, these two theories being the eigenstate (Bloch wave) and multislice theories. Examples of computed results are given for each of the methods discussed, and it is shown that in order to obtain accurate results the beams included in a calculation must extend out in reciprocal space to inverse spacing values of approximately 40 nm-1. From the examples given, a comparison of the methods is made and the relative merits of each method is discussed.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics