Experimental Studies of Phase Transitions

这个实验项目将推进对相变的基本理解，并使用先进的激光散射光谱方法对理论模型进行严格测试。具体来说，将研究液-玻璃转变，重点是过冷液体的动力学和液-玻璃转变的物理机制。测量与理论的定量比较将集中在模式耦合理论上，但不限于此，该理论为过冷液体的动力学及其随温度的演变提供了一套详细的预测。除了光散射数据外，对几个理论的关键评估将包括来自合作小组使用中子散射、介电磁化率和分子动力学技术的数据。该项目将推进对相变的基本理解，并使用先进的激光散射光谱方法对理论模型进行严格测试。具体来说，将研究液-玻璃转变，重点是过冷液体的动力学和液-玻璃转变的物理机制。测量与理论的定量比较将集中在模式耦合理论上，但不限于此，该理论为过冷液体的动力学及其随温度的演变提供了一套详细的预测。除了光散射数据外，对几个理论的关键评估将包括来自合作小组使用中子散射、介电磁化率和分子动力学技术的数据。＊＊＊

w:\awards\awards96\num.doc 9616577 Cummins This experimental project will advance the fundamental understanding of phase transitions, and critically test theoretical models, using advanced methods of laser light scattering spectroscopy. Specifically, the liquid-glass transition will be studied, with emphasis on the dynamics of supercooled liquids and the physical mechanism underlying the liquid-glass transition. The quantitative comparison of the measurements with theory will focus on, but not be limited to, the Mode Coupling Theory, which provides a detailed set of predictions for the dynamics of supercooled liquids and their evolution with temperature. The critical evaluation of the several theories will include, in addition to the light scattering data, data from collaborating groups using neutron scattering, dielectric susceptibility, and molecular dynamics techniques. %%% This project will advance the fundamental understanding of phase transitions, and critically test theoretical models, using advanced methods of laser light scattering spectroscopy. Specifically, the liquid-glass transition will be studied, with emphasis on the dynamics of supercooled liquids and the physical mechanism underlying the liquid-glass transition. The quantitative comparison of the measurements with theory will focus on, but not be limited to, the Mode Coupling Theory, which provides a detailed set of predictions for the dynamics of supercooled liquids and their evolution with temperature. The critical evaluation of the several theories will include, in addition to the light scattering data, data from collaborating groups using neutron scattering, dielectric susceptibility, and molecular dynamics techniques. ***