Fig. 1: Experimental geometry of momentum-resolved EELS. | Nature

Fig. 1: Experimental geometry of momentum-resolved EELS.

From: Magnon spectroscopy in the electron microscope

Fig. 1

a, Schematic representation of the geometry of ω–q vibrational EELS measurements using a rectangular slot collection aperture. b, Experimental diffraction pattern along the NiO \([\bar{1}10]\) zone axis at a 2.25 mrad convergence angle, with the monochromating slit inserted, showing the orientation of the slot EELS collection aperture along the 220 row of systematic Bragg reflections in diffraction space. Scale bar, 2.5 Å−1, 20 mrad.

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