OPTICAL-ABSORPTION SPECTRUM OF CO2+ ION IMPURITIES IN LITHIUM SODIUM-POTASSIUM SULFATE SINGLE-CRYSTAL

Optical absorption spectrum of Co2+ ions doped in lithium sodium potassium sulphate single crystal has been studied at room and liquid nitrogen temperatures. The observed bands are assigned as transitions from the ground T-4(1g)(F) to various excited quartet and doublet levels of Co2+ ion in octahedral symmetry. The splitting in one of the bands at liquid nitrogen temperature has been explained as due to spin-orbit interaction. All the observed band positions have been fitted with the parameters B, C, D-q and xi.