Scattering Cross-Section of Carbon at Small Angle

Abstract

IN a previous communication¹ it was shown that, in the angular range α < 10⁻² radian, the values of the scattering cross-section of carbon for 50-kV. electrons as calculated from electron scattering formulæ² do not satisfactorily agree with experimental results. The above theoretical calculation was based on Wentzel atomic radius as given by R = a_H/Z$\frac{1}{3}$ = 0.29 Å. However, if, according to Lenz², R is expressed as ((H)/6Z)^½ with (H) = 16.58 a²_H on Hartree atom model and (H) = 7.60 a²_H from diamagnetic susceptibility value, the magnitude of the respective atomic radii becomes 0.36 Å. and 0.24 Å.