An electron paramagnetic resonance study of vanadyl ions doped into ammonium selenate single crystals was carried out at room temperature. It was found that the VO2+ ion takes up an interstitial site. The spin Hamiltonian parameters obtained from the crystal rotations were g||=1.9576, g⊥=1.9889, A||=203G, A⊥=78G. An optical absorption study was also carried out to evaluate various bonding parameters. On the basis of these parameters the nature of bonding in the complex was analysed.

Electron Paramagnetic Resonance and Optical Absorption of VO2+ Doped Ammonium Selenate Single Crystals. R.Kripal, A.K.Shukla: Chinese Physics Letters, 2011, 28[3], 037601