International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

International Tables for Crystallography (2006). Vol. C. ch. 4.2, p. 242

Section 4.2.6.1.2. Thomson scattering by a free electron

D. C. Creaghb

4.2.6.1.2. Thomson scattering by a free electron

| top | pdf |

From classical electromagnetic theory, it can be shown that the fraction of incident intensity scattered by a free electron is, at a position r, [\varphi] from the scattering electron, [I/I_0=(r_e/r){}^2\textstyle{1\over2}(1+\cos^2\varphi), \eqno (4.2.6.1)]where [r_e] is the classical radius of the electron (= 2.817938 × 10−15 m). The factor [\textstyle{1\over2}(1+\cos^2\varphi)] arises from the assumption that the electromagnetic wave is initially unpolarized. Should the wave be polarized, the factor is necessarily different from that given in equation (4.2.6.1)[link].

Equation (4.2.6.1)[link] is the basis on which the scattering power of ensembles of electrons is compared.








































to end of page
to top of page