ESTIMATION OF MN2-FIELD SPLITTING PARAMETERS FROM A POLYCRYSTALLINE EPR-SPECTRUM - CASE OF ORTHORHOMBIC DISTORTION( ZERO)

Expressions for the positions of forbidden hyperfine (h.f.) doublets, and those of the four peaks in each of the allowed h.f. line, in the c entral sextet of the EPR spectrum of the Mn2+ ion in a polycrystalline material have been derived, taking into account both the axial (D) an d the orthorhombic (E) parameters. It is concluded that more detailed information can be obtained from hyperfine forbidden doublet separatio ns by recording EPR spectrum at lower klystron frequencies. On the oth er hand, the allowed line positions can be used to estimate the parame ters D, E at higher klystron frequencies, where they are better resolv ed. Strategies have been discussed on how to estimate the Values of D and E from a polycrystalline Mn2+ EPR spectrum using these expressions depending on resolution of h.f. lines, without computer simulations.