Linear and non-linear Electron Spin Resonance spectroscopies have been designed to study the decay of the orientation correlations on different time scales. The reorientation of radicals (<<spin probes>>) dissolved in host phases (in the present case a polymeric liquid crystal (PLC)) may be investigated in the time window 10(-11)-10(-5) s. Evidence of the non-exponential regression of fluctuations is given. The temperature dependence of the correlation time of the spin probe orientation is discussed in the case of semi-crystalline PLCs and contrasted with the case of amorphous PLCs.
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