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The reorientation of one small paramagnetic molecule (spin probe) in glassy polystyrene (PS) is studied by high-field Electron Paramagnetic Resonance spectroscopy at three different Larmor frequencies (95190 and 285GHz). Two different regimes separated by a crossover region are evidenced. Below 180K the rotational times are nearly temperature-independent with no apparent distribution. In the temperature...
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