Persistent IR Spectral Holeburning in Glasses, Glass-Like Crystals and Crystals

本研究的目的是识别和表征各种晶体和无序固体中持续的红外光谱效应。该技术为缺陷动力学和局部环境提供了一个高分辨率窗口，测量了激发振动态的消相时间，并探测了晶体和无序固体中的低处非平衡弹性构型。将探索四种不同类型的系统：1)类玻璃晶体将为研究玻璃中的低洼态提供新的途径；2)硫系玻璃的持续光变暗与持续红外烧孔之间存在明显的强相互作用；3)聚合物的玻璃化行为是否转化为持久的光谱效应；4)与碱卤化物中重金属杂质相关的杂质诱导远红外光谱是否持久。

The purpose of the proposed research is to identify and characterize persistent IR spectral effects in a variety of crystalline and disordered solids. The technique provides a high resolution window into defect dynamics and the local environment, measures the excited vibrational state dephasing time and probes the low lying non-equilibrium elastic configurations in both crystalline and disordered solids. Four different types of systems will be explored: 1) glass-like crystals will provide a new approach for studying low lying states in glasses; 2) the apparent strong interaction between persistent photodarkening and persistent IR hole burning in chalcogenide glasses; 3) whether glassy behavior in polymers translates into persistent spectroscopic effects; 4) whether the impurity-induced far IR spectrum associated with heavy metal impurities in alkali halides is persistent.