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Figure 3730 gives a very simplified illustration of how the incident electrons travel through the TEM column. r is the real space coordinates in the sample or image, u is the reciprocal space coordinates and θ is the scattering angle.
![TEM Image Formation Process](image1/3732c.gif)
Figure 3730. Simplified illustration of how an image is formed in a TEM column.
Assuming that in the image plane of a TEM the electron wavefunction is given by ψ(x) in real space and φ(k) in reciprocal space, the two wavefunctions correlate each other through the form of Fourier transform, given by,
----------------------- [3730a]
In reciprocal space the electron wavefunction φ(k) is related to the wavefunction φE(k) on the exist face of the TEM film through the expression given by,
----------------------- [3730b]
where,
T(k, |g|) -- The contrast transfer function (CTF)
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