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The nine spin-Hamiltonian (SH) parameters (g-factors g i  and hyperfine structure constants  147 A i  and  149 A i  for  147 Sm 3+  and  149 Sm 3+  isotopes, where i = x, y, z) for the Samarium(III) ion in monoclinic potassium yttrium tungstate [KY(WO 4 ) 2 ] crystal are calculated within the rhombic symmetry approximation from a diagonalization of energy matrix method. Differing from the conventional diagonalization method used in the calculation of crystal-field levels, in the present method, we attach the Zeeman (or magnetic) and hyperfine interaction terms to the conventional Hamiltonian and construct the 66×66 energy matrix for 4f 5  ions in rhombic crystal field and under an external magnetic field by considering all the ground-term multiplets 4H J . The calculated results are in reasonable agreement with the experimental values

A Theoretical Study on the Spin-Hamiltonian Parameters for Samarium(III) Ion in Potassium Yttrium Tungstate Crystal