Abstract
The positron angular correlation curves were measured along the [100], [110] and [111] directions of NiO single crystals. A simple calculation based on the localized ion model shows that the measured anisotropy is ascribed to the uncompleted 3d orbitals of Ni with a slight covalent mixing of oxygen 2p orbitals.
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Chiba, T., Tsuda, N. Anisotropy in the angular correlation curves of NiO. Appl. Phys. 5, 37–40 (1974). https://doi.org/10.1007/BF01193391
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DOI: https://doi.org/10.1007/BF01193391