Dynamic symmetry of charge-dipole interaction in scattering and relaxation

A quasiclassical realization of the irreducible tensor operators in the basis of spin coherent states is proposed. The dynamic symmetry of charge-dipole interaction is considered and the classical Bloch equation of motion of the moment of state of the perturbing particle during the collision is obtained. The exact M-exchange matrix is found on this basis. The data of the scattering problem are employed to analyze the collision anisotropy in the relaxation and spectral structures. An increase of the relaxation rate with growth of the multipole moment of the state in isotropic collisions is predicted. It is found that the anisotropic part of the relaxation rates due to the ''wind effect'' is 1/√8-1/√5 of the isotropic part. A consequence of this effect is that the line contour may result from superposition of a sharp and broad components