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Dynamics in Molecular Solid State Systems

分子固态系统动力学

基本信息

批准号：
8718959
负责人：
Michael Fayer
金额：
$ 58.86万
依托单位：
Stanford University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1988
资助国家：
美国
起止时间：
1988-01-15 至 1991-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8718959&HistoricalAwards=false
关键词：
Dynamics Molecular Solid State Systems

项目摘要

An investigation of dynamics and intermolecular interactions in molecular solid state systems. Picosecond and subpicosecond nonlinear experiments combined with ultrahigh resolution spectroscopy, conventional optical spectroscopy and theory are used to study isolated molecules in crystals and glasses, weakly interacting molecules in impurity band systems, and strongly interacting molecules in pure crystal exciton systems. In glasses by combining photon echo and other optical coherence experiments with optical holeburning experiments, acoustic measurements and heat capacities, a new and detailed picture of dynamics and intermolecular interactions in these nonequilibrium systems is emerging. In the impurity band problem, photon echo experiments are shown to be a direct observable for the concentration dependent delocalization of electronic excitations in mixed crystal systems. The application of phase related pulse sequences, particularly the optical dipolar echo, to the impurity band problem is described using a new approach for generating picosecond pulses with well defined phase relationships. The applications of picosecond transient grating techniques to the investigation of exciton transport and polariton effects in pure molecular crystals are discussed. A combination of photon echo experiments and polarization grating techniques are used to examine the relationship between the mechanical motions of molecules and coupling to electronic states as observed by optical dephasing.

分子间相互作用和动力学研究分子固态系统皮秒和亚皮秒非线性实验与非线性分辨率相结合光谱学，传统的光学光谱学和理论，用于研究晶体和玻璃中的孤立分子，杂质带系统中的相互作用分子，纯晶体激子系统中的相互作用分子。在结合光子回波和其它光学相干性的眼镜光学烧孔实验，声学测量和热容，一个新的和详细的图片，动力学和分子间的相互作用系统正在出现。在杂质带问题中，光子回波实验表明是一个直接观察的电子激发的浓度依赖离域在混合晶体系统中。相位相关脉冲的应用序列，特别是光学偶极回波，到杂质带的问题是使用一种新的方法来产生皮秒脉冲具有良好定义的相位关系。的皮秒瞬态光栅技术在纯晶体中激子输运和极化激元效应研究分子晶体进行了讨论。结合光子回波实验和偏振光栅技术，研究机械运动之间的关系分子和耦合到电子状态，如观察到的光学退相