Ultrafast Dynamics of Molecular Solids Under High Pressure

在化学部实验物理化学计划的支持下，Chronister将结合高压金刚石砧座技术和超快非线性相干光谱方法作为分子固体的高分辨率探测器。红外和可见光光子回波实验将在混合分子固体和非晶态玻璃上进行，以阐明凝聚相中发生的动力学过程。拟议的实验将检验非均匀加宽固体中的电子和振动动力学随温度和密度的变化，并将用于完善非晶态和混合晶体固体中的光学和振动去相理论。施加到材料上的高压提供了一种以持续可控的方式改变固体中分子之间相互作用的方法。这使得系统地研究存在于原子水平上的引力和排斥力成为可能。Chronister将测量固体在高压和低温条件下的行为。收集到的信息很难获得，因为涉及的压力极高，温度非常低。然而，这些数据最终将有助于我们理解固溶体中物种与其宿主材料之间的动态相互作用。这里进行的各种研究也揭示了材料在极端条件下的行为。

In this project supported by the Experimental Physical Chemistry Program of the Chemistry Division, Chronister will combine high-pressure diamond anvil techniques and ultrafast nonlinear coherent spectroscopic methods as a high-resolution probe of molecular solids. Infrared and visible photon echo experiments will be conducted on mixed molecular solids and amorphous glasses in order to elucidate the dynamical processes taking place in condensed phases. The proposed experiments will examine electronic and vibronic dynamics in inhomogeneously broadened solids as a function of temperature and density and will be used to refine theories of optical and vibrational dephasing in amorphous and mixed crystalline solids. High pressure applied to materials provides a way of altering the interactions between molecules in a solid in a continuously controlled manner. This allows for the systematic study of the attractive and repulsive forces that exist on an atomic level. Chronister will measure the behavior of solids under high pressure and low temperature conditions. The information gathered is difficult to obtain because the pressures involved are extremely high and temperatures are very low. However, these data will ultimately aid our understanding of the dynamic interactions between species in solid solution and their host materials. The sorts of studies undertaken here also reveal much about the behavior of materials under extreme conditions.