The Study of Coordination Symmetry and Spectrum Analysis of Ferrous Ions in Rhodonite

The coordination symmetry and the absorption spectrum of Fe²⁺ ions in rhodonite were studied by means of a recently proposed simplified strong-field scheme. The results show that the symmetry of M₄ site is nearly C₃, this consist with the estimate made by Mar shall and Runciman. But the assignment of the bands is quite different from that made by them, especially the ground state is A" instead of A’, the band at 8000 cm^-1 is due to the O_A transition of the sites M_1-3 instead of the C₃ transition of the M₄ site.