Abstract
X-ray magnetic circular dichroism spectra have previously been obtained by switching the polarization helicity with a diamond quarter-wave plate (QWP) and keeping the applied magnetic field on the sample as an independent variable [Giles, Malgrange, Goulon, de Bergevin, Vettier, Fontaine, Dartyge & Pizzini (1994). Nucl. Instrum. Methods, A349, 622–625]. These results were obtained by subtracting an undesirable non-magnetic residual spectrum. Experiments reported here show that this residual spectrum mainly originates from a slight lateral displacement of the forward-diffracted beam in the QWP. A quantitative analysis of the phenomenon is in good agreement with predictions from X-ray dynamical theory.
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