Abstract
The optical absorption spectrum of lithium rubidium sulphate single crystals doped with Mn 2+ ion is investigated both at laboratory and liquid-nitrogen temperatures. The spectrum is characteristic of Mn 2+ ion in octahedral symmetry. The interelectronic repulsion ( B,C), crystal-field ( Dq) and Trees' polarization correction (α) parameters which give a good fit to the observed band positions are B= 850 cm −, C=2950 cm −, Dq=800 cm − and α = 76 cm −.
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