A U.S.-New Zealand Collaborative Study of the Infrared Properties of Crystals

该奖项支持A. J. Sievers博士访问 原子物理实验室材料科学中心 康奈尔大学到坎特伯雷大学 新西兰基督城，与J.A.博士合作。坎贝尔在 玻璃状晶体红外特性的研究。 玻璃 晶体代表了一种新的材料系统， 固体中玻璃行为的普遍特征， 试探 虽然X射线衍射显示晶体 在玻璃态下保持其长程有序， 温度热力学测量表明， 低能量谱似乎与 眼镜 坎贝尔博士建议， 玻璃态Ba（1-x）La（x）F（2+x）晶体，其中x从 0.001至0.46，使得玻璃参数以 系统的方式。 西弗斯博士提议 持续的红外光谱烧孔测量这些 系统来比较低洼地区 非平衡态对热力学浓度的影响 玻璃态。 这个持久化的 红外光谱烧孔技术将提供一种新的 调查和量化自然灾害的方法 玻璃中的低激发态的特性。 这些 实验也可能导致对过程的新理解 影响光学材料的应用，例如 激光玻璃中光激发的弛豫行为 以及玻璃态高密度光存储的持久性 hosts.

This award supports a visit by Dr. A.J. Sievers of the Laboratory of Atomic Physics & Materials Science Center of Cornell University to the University of Canterbury in Christchurch, New Zealand, to work with Dr. J.A. Campbell on a study of the infrared properties of glassy crystals. Glass crystals represent a new materials system in which the universal character of glass behavior in solids can be probed. Although X-ray diffraction shows that crystal retains its long range order in the glassy state, low temperature thermodynamic measurements show that an additional low energy spectrum appears identical to that found in glasses. Dr. Campbell proposes to grow and characterize glassy Ba(1-x)La(x)F(2+x) crystals where x is varied from 0.001 to 0.46 so that the glass parameter is altered in a systematic manner. Dr. Sievers proposes to carry out persistent IR spectral hole burning measurements on these systems to compare the concentration of low lying nonequilibrium states to the concentration of thermodynamic glassy states. This proposed application of the persistent IR spectral hole burning technique will provide a new methodology for investigating and quantifying the physical characteristics of the low lying states in glasses. These experiments may also lead to a new understanding of processes influencing optical materials applications such as the relaxation behavior of optical excitations in laser glasses and the permanence of high density optical storage in glassy hosts.