Multiply Charged Negative Ions

田纳西大学的罗伯特·康普顿（Robert Compton）得到了实验物理化学计划（Experimental Physical Chemistry Program）的资助，进行实验，研究戴安离子的产生及其在光分离作用下的破坏。这些研究将包括大的含碳分子和较小的含氟金属。通过激光解吸、负离子与供电子气体的快速碰撞、气相电子附着、电喷雾和在氟中燃烧金属线等多种方式产生离子。在激光解吸过程中，研究了磁场对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，如碰撞电子附着截面、电子亲和、键解离能和附着阈值。这些数据将用于研究电子和单阴离子之间的相互作用势，并探测所涉及的库仑势垒。所提出的研究将使人们对电子与带单个负电荷的分子之间的相互作用有更深入的了解。这样产生的双带电分子在质谱的新兴领域中很重要，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高压加速器（如国家散裂中子源）中都有应用。

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.