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

小的卤代甲烷、乙烯和磷化合物 将用可调真空照射 几个同步加速器的紫外辐射和X射线 辐射设施。 X射线吸收激发和/或电离 核心电子，最终产生不稳定的双电荷 容易分裂成离子对的离子。 离子-离子 符合实验将检测离子对产生的 双电荷物质的单键和多键断裂。 结果将有助于阐明分子片段的变化- 选择性核心电子激发诱导的电子模式， 作为分子大小、卤素取代和 激发波长 这笔规划补助金将提供资金 设备、教师和本科生研究工资， 前往同步辐射设施， 实验和出版成本。 在资助期间， 实验装置的设置和构造. 卡尔顿学院将接近完成，并将涉及 本科研究生。 实验室内的电子枪 将购买模拟X射线的设备， 测试飞行时间离子质谱仪 合作- 与同事进行与所列相似的实验 以上将保持博士费雷特参与新的实验， 她的领域，同时提供离子符合所需的专业知识， 技术. %%% 研究规划赠款使以前没有 独立的联邦研究支持， 研究项目。 该项目涉及同时 检测由较大的双分子分解产生的离子 带电离子，从而提供关于 选址核心后发生的事件的性质 电子激发

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.