Abstract: The electronic configuration of Gd(Ⅲ) is 4f⁷. Stronger Spin Spin interaction existing between 7 unpair electrons, bring about the EPR spectra overlap mutually, and results an envelope line. Useful information could not obtain practically, and limited the EPR spectra application to this field. Using a simulation program resolve out each spectrum and determine their g-values from envelope line at first, then using another program calculated the Zero-field Splitting Tensors D and E according to above obtained g-value, were reported in this paper. These two programs are edited by ourselves. Applied to analysis of EPR spectra of 5 Gd(Ⅲ) different β-diketone complexes, calculated their Zero-field Splitting Tensors D and E, satisfactory results were obtained.

Key words: Gd(Ⅲ), β-diketone complexes, EPR spectrum, Zero-field splitting tensors