Fourier Imaging Correlation Spectroscopy in Polymers and Small Molecular Liquids

在这个由化学部实验物理化学计划资助的项目中，马库斯将对聚合物和过冷分子液体的傅里叶相关成像光谱(FCIS)进行研究。这项工作包括四项任务：1)提高探测从万分之一秒到1000秒的时间尺度上来自分子系综的密度涨落的技术的灵敏度；2)开发偏振敏感版本的FCIS；3)将FCIS与双色和电子能量转移(EET)测量相结合；以及4)扩展FCIS技术以研究亚纳秒时间尺度上跃迁偶极弛豫的涨落。这些发展将应用于几个精心挑选的分子和聚合物，以回答有关柔性聚合物和过冷分子液体的分子形状、聚合物主干柔性、分子间内聚力和其他关键问题的关键问题。这是一个跨学科的项目，在物理化学、材料科学和生物学之间架起了桥梁。研究生和本科生都将参与这项研究，并将获得先进的、最先进的实验和理论技术的技能和知识。

In this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division, Marcus will do research on Fourier Correlation Imaging Spectroscopy (FCIS) of polymers and super-cooled molecular liquids. The work consists of four tasks: 1) to improve the sensitivity of the technique to detect density fluctuations from molecular ensembles over time scales ranging from one hundred thousandths of a second to 1000 seconds; 2) to develop a polarization sensitive version of FCIS; 3) to combine FCIS with two-color and electronic energy transfer (EET) measurements; and 4) to extend the FCIS technique to study fluctuations of transition dipole relaxations on sub-nanosecond time scales. These developments will be applied to several carefully selected molecules and polymers to answer critical questions about the molecular shape, polymer backbone flexibility, intermolecular cohesive forces, and other critical problems of flexible polymers and super-cooled molecular liquids. This is an interdisciplinary project that builds bridges between physical chemistry, materials science, and biology. Graduate as well as undergraduate students will participate in the research and will acquire skills and knowledge of advanced, state-of-the-art experimental and theoretical techniques.