Study of Low Frequency Collective Modes of Hydrogen Bonded Liquids in Bulk Mixtures and at the Liquid/Solid Interface Using Time Domain THz and THz-SHG Spectroscopy

使用时域 THz 和 THz-SHG 光谱研究散装混合物中和液/固界面处氢键液体的低频集体模式

• 批准号: 0111728
• 负责人: Harry Tom
• 金额: $ 41.9万
• 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: 2001
• 资助国家: 美国
• 起止时间: 2001-08-15 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0111728&HistoricalAwards=false
• 关键词: Study; Low; Frequency; Collective; Modes

Professor Harry Tom of the University of California Riverside is supported by the Analytical and Surface Chemistry Program to use terahertz spectroscopy to study hydrogen bonded liquids and the solid/liquid interface. Time-domain terahertz spectroscopy will be improved by extending the range to as low as 0.002 THz using instrumental and data analysis advances. Secondly the low frequency features will be analyzed using memory kernal formalism to extract collective molecular orientation, angular velocity, and potentially also cross-coupling strengths. These methods will be used to study ionic solutions as well as solutions of increasingly complex molecules leading up to biomolecules such as DNA. Lastly, THz pump and time-resolved second harmonic generation will be developed for the study of solid/liquid interfaces (namely, phenol derivatives adsorbed at the water/silica interface). Terahertz spectroscopy has only recently come on the scene as a new method for probing very low frequency motions, and this new information promises to be of importance in understanding condensed liquids, interfaces, as well as biological media.

加州大学滨江分校的Harry Tom教授得到了分析和表面化学项目的支持，使用太赫兹光谱学研究氢键液体和固/液界面。 时域太赫兹光谱将通过使用仪器和数据分析的进步将范围扩展到低至0.002 THz来改进。 其次，将使用记忆核形式主义分析低频特征，以提取集体分子取向、角速度以及潜在的交叉耦合强度。 这些方法将用于研究离子溶液以及导致生物分子（如DNA）的日益复杂的分子溶液。 最后，太赫兹泵和时间分辨二次谐波产生将被开发用于研究固/液界面（即，吸附在水/二氧化硅界面的苯酚衍生物）。 太赫兹光谱学最近才作为一种探测极低频运动的新方法出现，这一新信息有望在理解冷凝液体、界面以及生物介质方面发挥重要作用。