Studies of Quantum Fluids and Solids

小行星9623777 拟议的工作的主题是研究固体氦中的超大振幅量子运动的后果。第一个目标是观察和测量3He原子在三个、四个和六个粒子环中的交换率。根据理论，环状交换运动是导致固体3He中独特的核磁有序的原因。环交换运动从未被直接观察到。必须发展特殊的核磁共振技术来进行观测。这项工作的另一个目的是试图通过使用磁共振成像来观察原子运动的新模式。一些不寻常的和重要的现象已经被预测，但从未被观察到。 研究人员将使用核磁共振技术来研究一种非常有趣的材料，固体氦。由于氦的质量非常轻，即使在接近绝对零度的温度下，它的原子运动也相当大。现代磁共振技术将被用来研究这种运动的性质和后果。例如，固态氦的零温度状态被预测为原子以环状旋转的方式快速移动，而不是安静地坐在固定的晶格点上。 ***

9623777 Richardson The theme of the proposed work is to examine the consequences of the very large amplitude quantum motion in solid helium. The first objective is to observe and measure the rates of exchange of 3He atoms in three, four, and six particle rings. According to theory, the ring-like exchange motion is responsible for the unique nuclear magnetic ordering in solid 3He. The ring exchange motion has never been directly observed. Special nmr techniques will have to be developed for the observation. A further objective of the work is an attempt to see new modes of atomic motion by using Magnetic Resonance Imaging. Several unusual and important phenomena have been predicted but have never been observed. %%% The researchers will use nuclear magnetic resonance techniques to study a remarkably interesting material, solid helium. Because helium has such a very light mass, its atomic motion is quite large even near absolute zero temperature. Modern magnetic resonance techniques will be used to study the nature and consequences of that motion. For example, the zero temperature state of solid helium has been predicted to have the atoms moving rapidly in ring like rotations, rather than sitting quietly at fixed crystalline lattice points. ***