U.S.-Sweden Cooperative Research: Penning Ionization of Metastable Ions

9731212莱文这个合作研究奖支持乔恩莱文，伊万塞尔林，和学生从他们的小组在田纳西州诺克斯维尔大学与亨利克Cederquist博士的物理系在斯德哥尔摩大学，瑞典合作。 当处于激发态的原子离子与中性原子碰撞时，入射离子的状态变化可以作为光子辐射出去，或者转移到中性原子，使其发生散射（潘宁辐射）。 美国研究小组开发了一种实验技术，可以首次将辐射和非辐射贡献分离到总截面中，用于激发离子的淬灭。 这种新技术可以测量分支率和部分速率。 在这一领域拥有世界一流专业知识的瑞典小组将参与扩大实验，以包括尚未用作目标的几种原子和分子。

9731212LevinThis cooperative research award supports Jon Levin, Ivan Sellin, and students from their group at the University of Tennessee-Knoxville to collaborate with Dr. Henrik Cederquist of the Physics Department at Stockholm University, Sweden. When an atomic ion in an excited state collides with a neutral atom, the resulting change of state of the incoming ion can be radiated away as a photon, or transferred to the neutral atom causing it to ionize (Penning radiation). The U.S. group has developed an experimental technique that can, for the first time, separate the radiative and non-radiative contributions to the total cross section for quenching of the excited ion. This new technique can measure branching rations and partial rates. The Swedish group, which has world-class expertise in this area, will participate in extending the experiments to include several species of atom and molecule not yet used as targets.