Abstract
Electron Paramagnetic Resonance (EPR) studies of VO 2+ ions in calcium fumarate trihydrate single crystals have been done at room temperature. EPR analysis indicates the presence of two magnetically inequivalent VO 2+ sites. For the two sites the spin Hamiltonian parameters are, Site I: g x = 1.9689 , g y = 2.0087 , g z = 1.9344, A x = 73 , A y = 88 , A z = 202; Site II: g x = 1.9675 , g y = 2.0100 , g z = 1.9346 , A x = 75 , A y = 90, A z = 206 (×10 −4) cm −1. The optical absorption study is also carried out at room temperature. By correlating EPR and optical data the nature of bonding in the crystal is discussed. The three-line superhyperfine structure has been attributed to two protons.
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