The Wannier-Mott exciton's dynamic properties without limitations on the magnitudes of the wave vectors of carriers

Most often, the excitation of the Wannier-Mott excitons' type is generated by electromagnetic action when the electron from the valence band passes into the conduction band. The influence of a magnitude wave vector for the exciton dynamic on the wave vector of the dynamics of the internal relative motion of the carriers is considered. It is shown that due to the effect of the field of intra-crystalline stresses on the exciton movement, a substantial displacement of the exciton spectrum may occur. Estimates of the possible magnitude of such a displacement were made.