Three distinct doublets of Fe²⁺ were distinguished in spectra of sphalerite solid solution Zn_1-x Fe_xS and their HFS parameters and relative intensities were evaluated. The original N-procedure was used, what permitted to solve the problem of close spectral components. The N-procedure improves the spectral resolution at the expense of signal-to-noise ratio and the fitting results are characterized by lower global correlation factors (up to 3-10 times), when the N-transformed spectra are used.

The relative intensities of partial spectral doublets A, B and C, corresponding to three distinct values of q.s., could be referred to three definite atomic configurations Fe - (Fe _n Zn _12-n ), just if the Fe²⁺ and Zn ions are distributed random. When one takes into account, that the symmetric pairs of Zn ions do not disturb the electric field gradient at the central Fe²⁺ ion, the C-doublet is to be referred to n_eff = 0, B doublet - to n_eff = 1 and A doublet to - n_eff = 2 or more.

The values of q.s. of doublets A, B and C are changing with composition a little, the isomer shift has the constant value for all doublets and does not depend on the composition. The data presented, at first prove the random distribution of Fe²⁺ and Zn²⁺ ions in the sphalerite solid solution Fe_xZn_1-xS, at least up to x = 0.32.