A. Pogoreltsev, V. Matukhin, O. Safonova, A. Sharipova, G. N. Islamova, E. Shmidt, D. Shulgin
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TOPOLOGICAL FEATURES OF THE ELECTRON DENSITY DISTRIBUTION IN COVELLITE: POSITION Cu1.
The synthesized sample of covellite was investigated by NQR 63,65Cu methods. The experimentally determined values of the quadrupole frequency νQ and the asymmetry parameter η have been used to study the distribution of electron density in the region of the quadrupole nuclei in position Cu1. It is found that Cu-S bond in position Cu1 is ionic, and the gap LUMO-HOMO decreases with increasing temperature.