  A simplified model for a collective dynamics in ionic melts is proposed for
the description of optic-like excitations. Within a polarization model of ionic
melt the analytical expressions for optic and relaxation dipole modes are
obtained. The considered model allows one to describe a softening of frequency
and an increase of damping of optic modes caused by polarization processes in
comparison with the rigid-ion model. The contributions related with ion
polarization to time correlation functions are calculated.
