Fine structure of ~6A_(1g) - > ~4A_(1g), ~4E_g (~4G) absorption band in MnF_2

摘要

Systematic spectroscopic measurements of the spectral lines in MnF_2 have been carried out in the temperature range 10-300 K. Observations of exciton and exciton-magnon sidebands in the fine structures of the ~6A_(1g) - > ~4A_(1g), ~4E_g (~4G) state of Mn~(+2) ions are reported at low temperatures for MnF_2. The fine structure of the C-band is mainly attributed to spin multiplicity in the ordered state. In addition, the pure exciton bands have been identified and the ratios for the separation energies between these lines are fitted with the ratios expected form Lande interval rule.