Dynamics of glass transitions probed by ultra-broadband spectroscopy

用超宽带光谱仪研究了玻璃化转变的动力学性质。用调制扫描量热仪研究了材料在10-100 MHz范围内的低频热性能，准确测定了材料的玻璃化转变温度。利用阻抗增益相位分析仪研究了材料在1~10 MHz频率范围内的介电性能，并研究了过冷液态下的α和慢β驰豫过程。在1 MHz~10 GHz的频率范围内，用时间域反射法研究了高温下的两种介电弛豫过程。在1 GHz~1000 GHz的布里渊散射中，研究了快弛豫或快β过程。用拉曼散射研究了其在0.1~100THz范围内的高频振动特性，并对玻色子峰进行了详细的研究。在非简谐模型的基础上，讨论了快过程与玻色子峰值的关系。

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.