Abstract
The optical absorption spectra of transition metal doped zinc hydrogen maleate tetrahydrate crystals are investigated. The present paper presents the results and analysis of the VO 2+ and Co 2+ doped crystals. In the case of VO 2+, EPR spectrum of the polycrystalline powder is also investigated. The results indicate that the octahedral site symmetry is tetragonally distorted in the case of VO 2+ and trigonally distorted in the case of Co 2+ ions. The following are some of the parameters evaluated. Vo 2+: Dq = 1613 cm −1 Ds = −2700 cm −1 Dt = 1176 cm −1 g = 1.930 g ⊥ = 1.981 A = 193G A ⊥ = 76G Co 2+: Dq = 910 cm −1 B = 900 cm −1 C = 3780 cm −1
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