ABSORPTION SPECTRA OF MNF2 AND CAMNF3.
Abstract:
Absorption spectra in the 3950A region of MnF2 and CsMnF3 at 4.2K are presented. The spectra show transitions from the sextuplet-gamma-1 ground state to the quadruplet-gamma-1 and quadruplet-gamma-3 excited states. Remarkable similarity in the spectra is observed, suggesting that magnetic interactions in both crystals are very similar. The sextuplet-gamma-1 to quandruplet-gamma-3 transitions appear to be the same both in the sigma and the P1 spectra. Fine structure is found on the sextuplet-gamma-1 to quadruplet-gamma-1 transitions. In the P1-spectra the fine structure seems to show a Lande interval pattern, and is interpreted in terms of a K,S1.S2 interaction S 32 with K 16.7cm for MnF2 and 16.8cm for CsMnF3 in the sigma-spectrum exchange coupling of ion pairs is observed. The pair is excited so that one ion gives into the S 32 state, while the other remains in the S 52 state. The selection rule is that the total spin of the pair is constant. Author