Molecular Fragmentation Studies Utilizing Ion-Ion Coincidence Techniques and Synchrotron Radiation

利用离子-离子符合技术和同步辐射进行分子断裂研究

• 批准号: 9110614
• 负责人: Tricia Ferrett
• 金额: $ 1.8万
• 依托单位: Carleton College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-15 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9110614&HistoricalAwards=false
• 关键词: Molecular; Fragmentation; Studies; Utilizing; Ion

Small halogenated methane, ethylene, and phosphorous compounds in the gas-phase will be illuminated with tunable vacuum ultraviolet radiation and X-rays at several synchrotron radiation facilities. X-ray absorption excites and/or ionizes core electrons, eventually producing unstable doubly charged ions which readily fragment into ion pairs. Ion-ion coincidence experiments will detect ion pairs resulting from single and multiple bond rupture of the doubly charged species. Results will help elucidate variations in molecular fragment- ation patterns induced by site-selective core electron excita- tion as a function of molecule size, halogen substitution, and excitation wavelength. This planning grant will provide funds for equipment, faculty and undergraduate research salaries, travel to synchrotron radiation facilities for collaborative experiments, and publication costs. During the grant period, setup and construction of the experimental apparatus at Carleton College will be nearly completed and will involve undergraduate research students. An in-lab electron gun used to simulate x-rays will be purchased and utilized to assemble and test the time-of-flight ion mass spectrometer. Collabo- ration with a colleague on experiments similar to those listed above will keep Dr. Ferrett involved with new experiments in her field while providing needed expertise in ion coincidence techniques. %%% Research Planning Grants enable women who have not had prior independent Federal research support to develop a competitive research project. This project involves the simultaneous detection of ions resulting from decomposition of larger doubly charged ions thus providing critical information about the nature of events taking place after site selective core electron excitation.

气相中的小卤化甲烷、乙烯和磷化合物将在几个同步辐射设备上用可调谐的真空紫外线辐射和x射线照射。x射线吸收激发和/或电离核心电子，最终产生不稳定的双带电离子，这些离子很容易分裂成离子对。离子-离子重合实验将检测由双带电物质的单键和多键断裂产生的离子对。结果将有助于阐明由位点选择性核心电子激发引起的分子片段化模式的变化，作为分子大小，卤素取代和激发波长的函数。这项计划拨款将为设备、教师和本科生研究工资、前往同步辐射设施进行合作实验和出版费用提供资金。在资助期间，卡尔顿学院的实验设备的设置和建设将基本完成，并将涉及本科生的研究。将购买用于模拟x射线的实验室电子枪，用于组装和测试飞行时间离子质谱仪。与同事合作进行类似上面列出的实验将使费雷特博士在提供离子巧合技术所需的专业知识的同时，参与她所在领域的新实验。研究计划补助金使以前没有获得独立联邦研究支持的妇女能够发展具有竞争力的研究项目。该项目涉及同时检测由较大的双带电离子分解产生的离子，从而提供有关在位置选择性核心电子激发后发生的事件性质的关键信息。