Second-order Raman scattering in MgO

We have applied our recently formulated deformable-ion model, which encompasses both the shell model and the deformation-dipole model, to compute the lattice dynamics of MgO which is in very good overall agreement with the elastic constant, dielectric constant, and neutron scattering data. We use this lattice dynamics in the second-order Raman spectra calculations where the polarizability tensor constants are fitted to the experimental spectra. Our calculated spectra agree quite well with the experimental data.