97-16U

In the present paper the dynamics of pseudospin excitations in the Mitsui model with the random symmetrical longitudinal field is investigated by the two--time Green functions technique in the random phase approximation. Systems of equations for configurationally averaged pseudospin projections and for obtained in the coherent potential approximation configurationally averaged single--site Green functions are solved numerically. The random field in the framework of the applied bimodal distribution leads to appearance of two additional bands in the pseudospin excitation density of states and can change a phase diagram of the system qualitatively. The energy spectrum changes when the system have a transition between different phases.