ESR Studies of Covalency Effects between Cu2+ and Chalcogen Ions in AgCl Crystals
- 1 January 1969
- journal article
- research article
- Published by Wiley in Physica Status Solidi (b)
- Vol. 36 (1) , 143-152
- https://doi.org/10.1002/pssb.19690360114
Abstract
After irradiation in AgCl crystals doped with Cu and Se or S, respectively, an ESR spectrum of a Cu2+ ion is observed the octahedral chlorine environment of which is distorted by a Se2− or S2− ion. The centre has [100] tetragonal symmetry and a essentially |3 z2‐r2 > ground state. The superhyperfine structure in AgCl: 77Se, Cu indicates a strong interaction with one selenium nucleus. If σ‐bonding is assumed the magnitude of the covalency between the Cu2+ and the Se2− ion can be estimated: the hole spends about 20% of its time in a pz state of the Se2−. From the existence of this covalent bonding in the paramagnetic complex follows that the spin‐orbit coupling is more reduced in [Cu2+ Se2−] than in [Cu2+ S2−].Keywords
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