FINE STRUCTURE IN THE ABSORPTION SPECTRA KMNF3 AND RBMNF3.
EATON ELECTRONICS RESEARCH LAB MCGILL UNIV MONTREAL (QUEBEC)
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Experimental studies of the absorption spectra in the 3900A region of KMnF3 and RbMnF3 at 4.2K are presented. The spectra of the two substances are almost identical, and show the same number of lines and type of fine structure. The quadruplet-gamma-3 levels, split by the tetragonal component of the crystalline field, are associated with observed transitions at approx. 3939A and 3896A. Definite energy level patterns are found for the weak vibrational lines accompanying these transitions. A sharp and very weak magnetic dipole line M is found with three components at approx. 3976A. An electric dipole line P1 at approx. 3966A appears to be a magnon sideband of the magnetic dipole line. M is presumed to be an exciton line associated with the electric dipole transition P2 at approx. 3955A to the main quadruplet-gamma-1 level. The electric dipole lines P1 and P2, associated with the quadruplet-gamma-1 level, show a fine structure which is interpreted in terms of exchange coupled pairs of ions with a Spin hamiltonian-2JS1S2. The selection rule for these transitions is that the total spin of the pair is conserved. Author
- Electricity and Magnetism
- Solid State Physics