Dynamical Properties of Frustrated Molecular Solids at Low Temperatures

小行星9623536 本计画将探讨低温下受抑淬灭无序系统的动力学性质。 这些研究将集中于确定原型取向玻璃（正和仲-二氢和二氮-氩固体混合物）中重要的低能集体激发，以及简化几何结构中量子四极杆的行为-二维阵列和表面熔化的量子晶格流体。建议的实验涉及几种不同的NMR和热力学测量，以确定低频热弛豫的性质和晶格几何形状的经典和量子转子在取向玻璃的顺序的影响。 新的实验还将探测量子交换的多层氢和氦-3膜物理吸附在正方形晶格基板的挫折和混乱的综合影响，预计导致核自旋玻璃相。 该项目具有基础性质，但结果可能会提供对广泛应用于技术和商业应用的玻璃性质的见解。 这个项目将研究低温下受抑、猝灭无序系统的动力学性质。 这些研究将集中于确定原型取向玻璃（正和仲-二氢和二氮-氩固体混合物）中重要的低能集体激发，以及简化几何结构中量子四极杆的行为-二维阵列和表面熔化的量子晶格流体。建议的实验涉及几种不同的NMR和热力学测量，以确定低频热弛豫的性质和晶格几何形状的经典和量子转子在取向玻璃的顺序的影响。 新的实验还将探测多层膜中的量子交换。 氢和氦-3膜物理吸附在正方形晶格衬底上，预测挫折和无序的组合效应会导致核自旋玻璃相。 该项目具有基础性质，但结果可能会提供对广泛应用于技术和商业应用的玻璃性质的见解。 ***

9623536 Sullivan This project will investigate the dynamical properties of frustrated quench-disordered systems at low temperatures. These studies will focus on determining the important low-energy collective excitations in prototypical orientation glasses (orthoand para-dihydrogen and dinitrogen-argon solid mixtures), and the behavior of quantum quadrupoles in reduced geometries - two dimensional arrays and surface-melted quantum latticed fluids. The proposed experiments involve several different NMR and thermodynamic measurements to determine the nature of the lowfrequency thermal relaxation and the effect of lattice geometry on the ordering of classical and quantum rotors in orientational glasses. New experiments will also probe quantum exchange in multilayers of dihydrogen and in helium-3 films physisorbed on square-lattice substrates for which the combined effects of frustration and disorder are predicted to lead to nuclear spin glass phases. The project is of fundamental character but the results may provide insights into the properties of glasses which are widely employed in technical and commercial applications. %%% This project will investigate the dynamical properties of frustrated, quench-disordered systems at low temperatures. These studies will focus on determining the important low-energy collective excitations in prototypical orientation glasses (orthoand para-dihydrogen and dinitrogen-argon solid mixtures), and the behavior of quantum quadrupoles in reduced geometries - two dimensional arrays and surface-melted quantum latticed fluids. The proposed experiments involve several different NMR and thermodynamic measurements to determine the nature of the lowfrequency thermal relaxation and the effect of lattice geometry on the ordering of classical and quantum rotors in orientational glasses. New experiments will also probe quantum exchange in multilayers of dihydrogen and in helium-3 films physisorbed on square-lattice substrates for which the combined effects of frustration and disorder are predicted to lead to nuclear spin glass phases. The project is of fundamental character but the results may provide insights into the properties of glasses which are widely employed in technical and commercial applications. ***