Abstract
The absorption spectra of KMnF3 and RbMnF3
in the region 17000-47000 cm-l are reported in detail for room
temperature and 20�K. Excellent
agreement between experiment and a ligand field calculation using the free atom
representation is obtained for the bands with energy less than 35000 cm-l.
The analysis of the bands with energy greater than this requires an explanation
involving the simultaneous excitation of pairs of manganese ions, and
consistent assignments of these bands for the spectra of KMnF3,
RbMnF3, and MnF2
are given. The relative order of the 4A1g
and 4Ega states is
established, and a theoretical argument to support this uses differences in
inter-electronic repulsion energies for the 4Ega;
and 4Egb states.
The theoretical line shapes for the magnon-exciton
bands of MnF2 at 25000 cm-1 are
compared with the observed shapes.
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