Premium
ESR Studies of Covalency Effects between Cu 2+ and Chalcogen Ions in AgCl Crystals
Author(s) -
Schwarz D.
Publication year - 1969
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19690360114
Subject(s) - chalcogen , tetragonal crystal system , ion , chemistry , crystallography , selenium , paramagnetism , octahedron , electron paramagnetic resonance , octahedral symmetry , covalent bond , ground state , crystal structure , atomic physics , nuclear magnetic resonance , condensed matter physics , physics , organic chemistry
After irradiation in AgCl crystals doped with Cu and Se or S, respectively, an ESR spectrum of a Cu 2+ ion is observed the octahedral chlorine environment of which is distorted by a Se 2− or S 2− ion. The centre has [100] tetragonal symmetry and a essentially |3 z 2 ‐ r 2 > ground state. The superhyperfine structure in AgCl: 77 Se, Cu indicates a strong interaction with one selenium nucleus. If σ‐bonding is assumed the magnitude of the covalency between the Cu 2+ and the Se 2− ion can be estimated: the hole spends about 20% of its time in a p z state of the Se 2− . From the existence of this covalent bonding in the paramagnetic complex follows that the spin‐orbit coupling is more reduced in [Cu 2+ Se 2− ] than in [Cu 2+ S 2− ].