The derivation of the atomic differential scattering cross-section (dσ T /dω) θ from the intensity distribution in the background of electron diffraction patterns is discussed, bearing in mind the possible effects of plural scattering. It is shown that the variation of (dσ T /dω) θ with specimen thickness reported by Haine and Agar is not real but appeared because the decrease in the unscattered intensity was over-estimated. After correction, their values for (dσ T /dω) θ are in reasonable agreement with Lenz's theoretical values for angles between 10 -3 and 2 × 10 -2 radians, but the experimental rate of decrease of (dσ T /dω) θ with increasing angle is smaller than expected. The effect of plural scattering on the intensity distributions from thicker specimens is not as great as that predicted by Lenz.
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J. S. Halliday (1960) studied this question.
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