Dynamics of glass transitions probed by ultra-broadband spectroscopy

用超宽带谱仪研究了玻璃化转变的动力学性质。利用调制扫描量热计在10-100mHz频段对其低频热特性进行了研究，并准确测定了草皮转变温度。利用阻抗增益相位分析仪研究了该材料在1mHz ~ 10MHz频率范围内的介电特性，并研究了过冷液体状态下的α和慢β弛豫过程。在1MHz ~ 10GHz频率范围内，用时域反射法研究了高温下液态介质的两个介电弛豫过程。在1GHz ~ 1000GHz的布里渊散射中，研究了快速弛豫或快速β-过程。利用拉曼散射在0.1 ~ 100THz范围内研究了其高频振动特性，并对玻色子峰进行了详细的研究。在非调和模型的基础上讨论了快速过程与玻色子峰的关系。

The dynamical properties of glass transition have been studied by ultra broadband spectroscopt. The low-frequency thermal properties were studied by the modulated scanning calorimeter at 10-100mHz, and the grass transition temperatures were accurately determined. The dielectric properties in the frequency range from 1mHz to 10MHz was studied by impedance gain phase analyzer, and the α and slow β relaxation processes were studied in super-cooled liquid states. While in liquid states at high temperatures the two dielectric relaxation processes were studied by the time domain reflectmetry in the frequency range between 1MHz and 10GHz. In Brillouin scattering in the range 1GHz to 1000GHz, the fast relaxation or fast β-process was studied. The high-frequency vibrational properties were studied by Raman scattering in the range between 0.1THz and 100THz, the boson peak was studied in details. Thecorrelation between the fast process and the boson peak was discussed on the basis of the anharmonic model.