Practical Electron Microscopy and Database

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Wavefunction in Defocusing Plane in TEM Imaging

If a parallel electron beam is normal to a specimen, the wavefunction in the defocusing plane of ±Δf can be given by         --------- [4213a] where,        ψ(x,y) -- Wavefunction in the specimen plane        Δf -- Defocus        (x, y ) -- Coordinates of the specimen plane        (xi, yi) -- Coordinates of the defocusing plane        λ -- Wavelength of the electron beam         --------------------------------- [4213b]         --------------------------------- [4213c]