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，Marcus将研究聚合物和过冷分子液体的傅立叶相关成像光谱（FCIS）。 研究工作包括四个方面：1）提高FCIS技术的灵敏度，使之能探测分子系综在十万分之一秒到一千秒时间尺度上的密度涨落; 2）研制偏振敏感型FCIS; 3）将联合收割机FCIS与双色和电子能量转移（EET）测量相结合; 4）将FCIS技术推广到亚纳秒时间尺度上研究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，以回答有关分子形状，聚合物主链柔性，分子间内聚力的关键问题，以及柔性聚合物和过冷分子液体的其他关键问题。这是一个跨学科的项目，建立物理化学，材料科学和生物学之间的桥梁。 研究生和本科生将参与研究，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.