HIGH-ENERGY MAGNETIC COMPTON-SCATTERING FROM IRON

The magnetic Compton profile of Fe [111] was measured using circularly polarized synchrotron radiation at incident energies of 84.4, 167.2 a nd 256.0keV on the high-energy beamline at the European Synchrotron Ra diation Facility. It was found that the momentum resolution of these e xperiments, which use semiconductor detectors, improves by almost a fa ctor of two over what was previously possible by this technique at pho ton energies of similar to(1/10)mc(2). It was also observed that all t hree spectra reduced to the magnetic Compton profile, describing the s pin-dependent ground-state momentum density, and that within the exper imental error the integrated intensity of the magnetic effect scaled a s predicted by the cross section derived in the limit of energies much less than the rest energy of the electron. The magnetic Compton profi le of Fe [111], measured using 167.2 keV incident energy and with mome ntum resolution of 0.42 a.u.. was compared with the prediction from a full-potential linearized augmented-plane-wave model profile. The fine structure predicted by theory was confirmed by the experimental profi le at this improved resolution.