Abstract
The ground state splitting of d 5 configuration ion Mn 2+ in ZnS:Mn 2+ has been studied by diagonalizing the energy matrices for electron–electron repulsion, spin–orbit coupling and trigonal ligand field interactions. It is shown that in order to give a unified explanation for the EPR parameters a, D and ( a− F) for Mn 2+ in ZnS:Mn 2+, a positive Dq has to be employed. This means that in tetrahedral ZnS the sulfur ion has a positive effective charge. This unusual result supports the Pauling's speculation that the sulfur ion in ZnS may be looked upon as an electron donor that forms a quadricovalent argon state of S 2+ with sp 3 hybrid configuration.
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