The Effect of Oblique Incidence on the Conditions for Single Scattering of Electrons by Thin Foils

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Abstract
In setting up and applying criteria for the single scattering of electrons by thin foils, it has been usual to assume that the principal deviations from single scattering are caused by the combination of small deflections with one large one. It is here shown that with electrons obliquely incident on the foil much more serious deviations may be caused by the combination of two deflections of the same order of magnitude. It is concluded that the difference observed by Chase and Cox between the scattering at 90° to the two sides of a foil on which electrons are incident at 45° may be ascribed to this cause. The bearing of this factor on the negative result of Dymond's experiment on the polarization of electrons is also considered.

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