Picosecond Rotational Diffusion Studies Using Time-Resolved and Phase-Resolved Spectroscopy

使用时间分辨和相位分辨光谱进行皮秒旋转扩散研究

• 批准号: 8713911
• 负责人: Mary Wirth
• 金额: $ 6.5万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-11-15 至 1989-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8713911&HistoricalAwards=false
• 关键词: Picosecond; Rotational; Diffusion; Studies; Using

This project is in the general area of analytical and surface chemistry and in the subfields of spectroscopy and separation science. Electronic spectroscopy affords a sensitive means of quantifying solutes. Because faster time scales are now accessible to electronic spectroscopy, this tool can be more readily used to obtain structural information. In particular, the size and shape of a solute determine its rotational diffusion behavior. Rotational diffusion studies of medium-sized organic molecules in common solvents require both picosecond spectroscopy and the resolution of multiple exponentially decreasing response signals. Professor Wirth and her students will measure the three components of the rotational diffusion constant of the solute tetracene which will enable an assessment of the extent to which structural information can be derived from this approach. However, if the solvent has short-range structural order, the presence of the solvent could potentially limit the solute information that is obtained. To address this issue, Professor Wirth will also study the effect of solvent structure on solute rotational diffusion. The results of these studies are expected to be valuable both to analytical spectroscopy and to an enhanced fundamental understanding of liquids.

这个项目是在一般地区的分析和表面 化学以及光谱学和分离的子领域 科学 电子光谱学提供了一种灵敏的方法， 定量溶质。 因为现在更快的时间尺度 可访问电子光谱，这个工具可以更多 很容易用来获取结构信息。 特别是， 溶质大小和形状决定其旋转扩散 行为 中等尺寸有机物的旋转扩散研究 普通溶剂中的分子需要皮秒光谱 和多重指数递减响应的分辨率 信号. 沃思教授和她的学生将测量这三个 溶质转动扩散常数分量 并四苯，这将使评估的程度， 结构信息可以从该方法中导出。 然而，如果溶剂具有短程结构有序， 溶剂的存在可能会限制溶质 获得的信息。 为了解决这个问题，教授 沃思还将研究溶剂结构对溶质的影响 旋转扩散 这些研究的结果是预期的 对于分析光谱学和增强的 对液体的基本认识。