Figure 1: Scheme of the experimental set-up.

(a) Side-view of the structure model of bcc iron tilted into a 3-beam orientation with the beam along the direction. (b) Top view of the structure model. Scanning direction is schematically shown by blue cone with arrows. (c) ADF survey image (acceleration voltage 200 kV, convergence semi-angle 10 mrad) showing atomic planes. The yellow scale bar denotes 2 Å. (d) ADF image acquired along with the acquisition of a spectrum image. Its size corresponds to the yellow rectangle marked in the ADF survey image. (e) Schematic placement of detectors for a classical EMCD approach in the 3-beam orientation. (f) Experimental diffraction pattern acquired in the same settings as the ADF survey image. (g) Detector placement in the here-proposed APR-EMCD approach. Note that in the classical approach we need two measurements at each beam position to acquire both chiral (+) and chiral (−) spectra, while in the APR-EMCD a single detector aperture is sufficient.