The role of the spin relaxation effects into both magnetic nanoclasters and low-spin paramagnetic complexes in nuclear forward scattering of synchrotron radiation

The effects of electron fluctuations on nuclear forward scattering of synchrotron radiation (SR) are theoretically modelled when a nuclear target is a low-spin protein complex. Two possible cases of the states of Moessbauer ion are considered: 1) the subsystems of electron and nuclear states which are independent from each other in the effective magnetic field model; 2) the coupled electron-nuclear system of states under no an external orient magnetic field. The influence of spin fluctuations on the pattern of quantum beats (QB) of resonant response OCR) to SR pulse is analysed in both general relaxation model and stochastic "strong redistribution" model of spectral diffusion.