Abstract
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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