Ultrafast Dynamics of Molecular Solids Under High Pressure

高压下分子固体的超快动力学

基本信息

批准号：
9714886
负责人：
Eric Chronister
金额：
$ 37.82万
依托单位：
University of California-Riverside
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-01-01 至 2001-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9714886&HistoricalAwards=false
关键词：
Ultrafast Dynamics Molecular Solids Under

项目摘要

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.

在化学分部实验物理化学计划支持的该项目中，Chronister将结合高压钻石砧技术和超快的非线性相干光谱法作为分子固体的高分辨率探针。将在混合分子固体和无定形玻璃上进行红外和可见的光子回声实验，以阐明在凝结相中发生的动力学过程。所提出的实验将检查不均匀拓宽固体的电子和振动动力学作为温度和密度的函数，并将用于完善无定形和混合晶体固体中光学和振动性脱位的理论。施加到材料的高压提供了一种以连续控制方式以固体方式改变分子之间的相互作用的方法。这允许对原子水平上存在的有吸引力和排斥力的系统进行系统的研究。计时器将在高压和低温条件下测量固体的行为。收集的信息很难获得，因为所涉及的压力极高，温度非常低。但是，这些数据最终将有助于我们理解固定溶液中物种与其宿主材料中物种之间的动态相互作用。这里进行的各种研究也揭示了极端条件下材料的行为。