ESR and optical study of Mn 2+ doped potassium hydrogen sulphate

Abstract

The ESR spectrum of Mn 2+ doped potassium hydrogen sulphate at liquid nitrogen temperature (77 K) has been analyzed and site of entered Mn 2+ in the lattice has been discussed. The values of the zero field parameters that give good fit to the observed ESR spectra have been obtained. The obtained g, A, B, D, E and a values are 2.0002, 66×10 −4 cm −1, 26×10 −4 cm −1, 59×10 −4 cm −1, 32×10 −4 cm −1 and −8×10 −4 cm −1, respectively. The percentage of covalency of the metal–ligand bond has also been estimated. From the optical absorption study at room temperature, the distortion has been suggested. The observed bands are assigned as transitions from the 6 A 1g( S) ground state to various excited quartet levels of Mn 2+ ion in a cubic crystalline field. The electron repulsion and crystal field parameters B, C, Dq and α providing good fit to the observed optical spectra have been evaluated and the values obtained for the parameters are B=627 cm −1, C=2580 cm −1 , Dq=790 cm −1 and α=76 cm −1.