C_4v Symmetry Crystal Field and Ground State Wavefunction of the VO²⁺ Ion

The spin-Hamiltonian parameters obtained from EPR studies of the VO²⁺ ion in different diamagnetic host lattices are used to estimate the ground state wavefunctions. These are of d_xy type with admixture of the excited states d_x²-y², d_yz and d_xz. The hyperfine interaction parameter and Fermi contact term for the VO²⁺ doped crystals are determined using the coefficients of the ground state. The various parameters are correlated to the ligand properties of the complexes.