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·塞林和他们在田纳西-诺克斯维尔大学的小组学生与瑞典斯德哥尔摩大学物理系的亨里克·塞德奎斯特博士合作。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电离(彭宁辐射)。美国研究小组开发了一种实验技术，首次可以分离辐射和非辐射对激发离子猝灭总截面的贡献。这项新技术可以测量分支配给和部分费率。这家瑞典集团在这一领域拥有世界级的专业知识，它将参与扩大实验范围，将几种尚未用作靶子的原子和分子包括在内。

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.