EPR and optical absorption studies of VO(II)-doped zinc Tris thiourea sulfate.

Electron paramagnetic resonance (EPR) of vanadyl ion as an impurity in polycrystalline zinc tris thiourea sulfate (ZTS), a prominent nonlinear optical host, has been studied at X-band frequencies at room temperature. Spin-Hamiltonian parameters and molecular orbital coefficients have been calculated. The optical absorption spectra have also been studied to deduce the crystal field parameters.