Structural Disorder and Spectral Dynamics in Hyperquenched Glasses and other Condensed Phase Systems

9908714小型超快冷玻璃和其他凝聚相系统中的结构无序和光谱动力学是对玻璃和其他无序系统中的结构无序和复杂构型弛豫的研究，这些问题是许多领域的研究热点，包括低温生物学、非晶态固态电子学和蛋白质的结构和功能。要研究的玻璃是分子玻璃，重点是水和其他氢键液体。要讨论的问题包括：玻璃和液体对探针的光激发的初始核(惯性)反应相似(与溶液中的化学反应动力学有关)；空间限制对玻璃的结构和弛豫过程的影响；低密度和高密度玻璃水中探针的光谱动力学和电子-声子耦合的比较；以及哺乳动物细胞中探针分子的光谱性质。将使用的技术是光谱烧孔(SHB)和光子回波光谱，以及一种用于形成玻璃的新型超猝灭设备。这些实验的挑战性和最先进的设备为本科生和研究生提供了极好的教育机会。对细胞中探测分子的基础研究将有助于确定光谱烧孔是否可以用于癌症的早期检测。

9908714SmallThe proposal entitled Structural Disorder and Spectral Dynamics in Hyperquenched Glasses and other Condensed Phase Systems is an investigation of structural disorder and complex configurational relaxation in glasses and other disordered systems, subjects of intense interest in many fields including cryobiology, amorphous solid state electronics and the structure and function of proteins. The glasses to be studied are molecular, with emphasis on water and other hydrogen bonding liquids. Issue to be addressed include: similarities in the initial nuclear (inertial) response of a glass and liquid to optical excitation of a probe (relevant to chemical reaction dynamics in solution); the effect of spatial confinement on the structure and relaxation processes of glasses; comparison of the spectral dynamics and electron-phonon coupling of a probe in low and high density glassy water; and the spectroscopic properties of probe molecules in a mammalian cells. Techniques to be used are spectral hole burning (SHB) and photon echo spectroscopies and a novel hyperquenching apparatus for formation of glasses.The challenging nature of the experiments and state-of-the-art equipment provide excellent educational opportunities for undergraduate and graduate students. The fundamental studies of probe molecules in cells will help establish whether spectral hole burning can be used in early detection of cancer.