Accession Number : AD0641917

Title :   ABSORPTION SPECTRA OF MNF2 AND CAMNF3.

Descriptive Note : Technical rept.,

Corporate Author : EATON ELECTRONICS RESEARCH LAB MCGILL UNIV MONTREAL (QUEBEC)

Personal Author(s) : Stevenson,Richard

Report Date : OCT 1966

Pagination or Media Count : 15

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 = 3/2) with K = 16.7/cm for MnF2 and 16.8/cm 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 = 3/2 state, while the other remains in the S = 5/2 state. The selection rule is that the total spin of the pair is constant. (Author)

Descriptors :   (*MANGANESE COMPOUNDS, ABSORPTION SPECTRA), (*ANTIFERROMAGNETISM, MANGANESE COMPOUNDS), CESIUM COMPOUNDS, FLUORIDES, CRYOGENICS, LINE SPECTRA, ATOMIC ENERGY LEVELS, ELECTRON TRANSITIONS, SELECTION RULES(PHYSICS), NUCLEAR SPINS, MAGNETIC PROPERTIES

Subject Categories : Electricity and Magnetism
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE