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We present a derivation of the orbital and spin sum rules for magneticcircular dichroic spectra measured by electron energy loss spectroscopy in atransmission electron microscope. These sum rules are obtained from thedifferential cross section calculated for symmetric positions in thediffraction pattern. Orbital and spin magnetic moments are expressed explicitlyin terms of experimental spectra and dynamical diffraction coefficients. Weestimate the ratio of spin to orbital magnetic moments and discuss firstexperimental results for the Fe L_{2,3} edge.

Experimental application of sum rules for electron energy loss magnetic chiral dichroism