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On the basis of the perturbation formulas for a $d^{1}$ configuration ion ina tetragonal crystal field, the three optical absorption bands and electronparamagnetic resonance (EPR) parameters ($g$ factors $g_{i}$ and hyperfinestructure constants $A_{i}$ for $i = \|$ and $\perp$, respectively) ofVO$^{2+}$ in Na$_{3}$C$_{6}$H$_{5}$O$_{7}\cdot2$H$_{2}$O single crystals werestudied using the perturbation theory method. By simulating the calculatedoptical and EPR spectra to the observed values, local structure parameters andnegative signs of the hyperfine structure constants $A_{i}$ of the octahedral(VO$_{6}$)$^{8-}$ cluster in trisodium citrate dehydrate single crystal can beobtained.

Theoretical studies of the optical and EPR spectra for VO$^{2+}$ in Na$_{3}$C$_{6}$H$_{5}$O$_{7}\cdot 2$H$_{2}$O single crystal