Multiply Charged Negative Ions

多重电荷负离子

• 批准号: 9981945
• 负责人: Robert Compton
• 金额: $ 24.3万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-02-15 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9981945&HistoricalAwards=false
• 关键词: Multiply; Charged; Negative; Ions

Robert Compton of the University of Tennessee is supported by a grant from the Experimental Physical Chemistry Program to perform experiments to study the production of dianions and their destruction by photodetachment. The studies will include both large carbon containing molecules and smaller fluorinated metals. The dianions will be generated in a variety of ways including laser desorption, fast anion collisions with electron donating gases, gas phase electron attachment, electrospray and burning metal wires in fluorine. In the laser desorption, the enhancement of dianion production by magnetic fields will be investigated. During these studies, fundamental thermodynamic and kinetic data will be obtained such as cross-sections for collisional electron attachment, electron affinities, bond dissociation energies and thresholds for attachment. These data will be used to investigate the interaction potential between the electron and the monoanion and to probe the Coulomb barrier involved.The proposed studies will lead to a greater understanding of the interaction of electrons with molecules having a single negative charge. The doubly charged molecules so produced are important in emerging fields of mass spectrometry and have applications in biology, medicine, as well as the technological areas of radiation chemistry, photochemistry, plasma physics and in high voltage accelerators such as the National Spallation Neutron Source.

田纳西大学的罗伯特·康普顿得到了实验物理化学计划的资助，他的任务是进行实验，研究双阴离子的产生和光分离对其的破坏。这些研究既包括大的含碳分子，也包括较小的含氟金属。阴离子将以各种方式产生，包括激光解吸、与电子供体气体的快速阴离子碰撞、气相电子附着、电喷雾和在氟中燃烧金属丝。在激光脱附过程中，我们将研究磁场对双阴离子产生的促进作用。在这些研究中，将获得基本的热力学和动力学数据，如碰撞电子结合截面、电子亲和能、键离解能和结合阈值。这些数据将被用来研究电子和单负离子之间的相互作用势，并探测所涉及的库仑势垒。建议的研究将使我们更好地理解电子与具有单一负电荷的分子的相互作用。由此产生的双电荷分子在新兴的质谱学领域非常重要，在生物、医学以及辐射化学、光化学、等离子体物理等技术领域以及国家散裂中子源等高压加速器中都有应用。