g Value of S-State Ions with (ns)¹ Configuration

A theory of the g shift is developed of S-state ions with an outer-shell configuration (ns)¹ at octahedral and tetrahedral sites in crystals. A partial electron transfer through spin-orbit interaction from ligand ions to the S-state ion is assumed to be a dominant source for the g shift. A superhyperfine interaction is also calculated in terms of molecular-orbital parameters which are used in the g shift. Some experiments are suggested to confirm that the partial electron transfer is a dominant source for the g shift.