EN
The EPR and optical spectra for VO^{2+} in C_3 H_7 NO_2 powders are calculated from complete diagonalization method and perturbation theory method, respectively. The calculated results are in good agreement with observed values. The negative signs of hyperfine structure constants A_∥ and A_⊥ for VO^{2+} in C_3 H_7 NO_2 powders are also suggested from the calculations.