Excess Electrons in Clusters and Liquid Jets

团簇和液体射流中的多余电子

• 批准号: 1011819
• 负责人: Daniel Neumark
• 金额: $ 82.17万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-15 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1011819&HistoricalAwards=false
• 关键词: Excess; Electrons; Clusters; Liquid; Jets

Hydrated electrons are important in many areas of the physical sciences. They play a key role in the radiation chemistry in nuclear reactors, and they mediate the damage to DNA caused by ionizing radiation. In this award, funded by the Chemical Structure, Dynamics and Mechanisms Program of the Chemistry Division, Prof. Daniel Neumark of the University of California, Berkeley and his graduate student colleagues will carry out spectroscopic and dynamical studies of excess electrons in negatively charged clusters, which serve as useful model systems for bulk hydrated electrons. These studies will be done using time-resolved photoelectron imaging (TRPEI), a femtosecond pump-probe technique. The research will seek to characterize the gas phase reactivity of excess electrons in DNA subunits, the time evolution of electronic absorption in negatively charged water clusters, and Auger emission decay in mercury cluster anions. In addition, a project will develop a liquid jet technique to conduct both time-independent and time resolved photoelectron spectroscopy of hydrated electrons in bulk water.The studies outlined will have a number of broader scientific impacts, since solvated electrons are ubiquitous in a number of scientific areas including atmospheric chemistry, biology, and medicine. The experiments on mercury cluster anions will shed light the photophysics of quantum dots and thus have relevance to solar energy conversion. The graduate students trained in this program will acquire significant skills in experimental and theoretical chemical physicsresearch.

水合电子在物理科学的许多领域都很重要。它们在核反应堆中的辐射化学中起着关键作用，并介导电离辐射对DNA造成的损伤。在这个由化学系化学结构、动力学和机制项目资助的奖项中，加州大学伯克利分校的丹尼尔·纽马克教授和他的研究生同事将对带负电荷的团簇中的过量电子进行光谱和动力学研究，这些团簇可作为大量水合电子的有用模型系统。这些研究将使用时间分辨光电子成像（TRPEI），飞秒泵浦探测技术。该研究将寻求表征DNA亚基中过量电子的气相反应性，带负电荷的水簇中电子吸收的时间演化，以及汞簇阴离子的俄歇发射衰减。此外，一个项目将开发一种液体喷射技术，用于对散装水中的水合电子进行时间独立和时间分辨的光电子能谱分析。概述的研究将产生许多更广泛的科学影响，因为溶剂化电子在许多科学领域中无处不在，包括大气化学，生物学和医学。汞团簇阴离子的实验将揭示量子点的量子物理，从而与太阳能转换有关。在该计划中培养的研究生将获得实验和理论化学物理研究的重要技能。