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Abstract
X-ray Compton profile of polycrystalline lithium was precisely measured at a scattering angle of 140 degrees for Cu K beta 1 radiation. The momentum transfer was relatively small (q=0.703 au) compared with usual Compton experiments. A double-crystal spectrometer was used and the resultant energy resolution was about 21 eV. The observed Compton profile was remarkably asymmetric. It was compared with a theoretical analysis which took into account the effects of crystalline field and electron correlation. The agreement between the theoretical curve and the experimental profile was fairly good. It is concluded that when the momentum transfer is not large enough, the Compton recoil conduction electrons are affected by the crystalline field, and the binding effect can not be neglected for the core electrons. Both electrons, therefore, can not be regarded as completely free and the Compton profile becomes asymmetric.
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