  The supergenerator of superparamagnetic system quantum evolution is
investigated in discrete orientation model (DOM). It is shown that the
generator is J-self-adjoint one at the case of potential drift field agreed
upon magnetic anisotropy of the sample investigated. Perturbation theory is
used for spectral analysis. The qualitative dependence of resonance absorption
spectrum on the relation between quantum and stochastic parameters is
demonstrated.
