U.S.-Sweden Cooperative Science: Atomic Structure & Collisions Research at Synchrotron and Tandem Accelerator Facilities

该奖项将支持田纳西大学诺克斯维尔分校的Ivan A.Sellin教授、隆德大学的Sven Huldt教授、瑞典斯德哥尔摩原子研究所的Anders Barany博士以及这些机构的其他人员之间的合作研究。这些物理学家将研究极低能量离子的产生和使用，包括它们在实验室模拟天体物理现象中的使用。此外，还将对低能离子俘获电子以及这种离子与金属表面的相互作用进行理论研究。塞林博士和他的瑞典同事早些时候的合作工作展示了X射线撞击如何产生低能离子；这些离子在天体物理现象的建模中很有用，也可以用于强离子源。这项研究将侧重于确定X射线撞击形成的低能离子的其他性质，开发生产这种离子的其他方法，并开发使用这些离子的实验技术。美国和瑞典的合作者在这一领域共享共同的仪器和技术元素，其中一位瑞典物理学家是飞行时间分析仪的开发者，该分析仪用于探索X射线产生的低能离子的产生率和温度。瑞典调查人员将受益于使用他们国家无法获得的X射线源，美国调查人员将受益于瑞典在仪器方面的专业知识。这项工作的结果可能会有重要的长期好处，使我们能够通过实验室实验增加对天体物理现象的理解，也通过促进适合于微制造和其他实验目的的离子束的产生。

This award will support collaborative research between Professor Ivan A. Sellin, University of Tennessee, Knoxville, and Professor Sven Huldt of the University of Lund, Dr. Anders Barany of the Atomfysik Institut in Stockholm, Sweden, and others at these institutions. These physicists will investigate the generation and use of very low-energy ions, including their use in the laboratory simulation of astrophysical phenomena. In addition, theoretical investigations will be made of the capture of electrons by low-energy ions, and of the interaction of such ions with metal surfaces. Earlier collaborative work of Dr. Sellin and his Swedish colleagues showed how low-energy ions could be produced by x-ray impact; these ions are useful in the modeling of astrophysical phenomena and can also be used in intense ion sources. This research will focus on determining additional properties of the low-energy ions formed by x-ray impact; on developing additional methods of producing such ions; and on developing experimental techniques for their use. The U.S. and Swedish collaborators share common elements of apparatus and techniques in this field, and one of the Swedish physicists is the developer of the time-of-flight analyzer used to explore production rates and temperatures of the low-energy ions produced by x-rays. The Swedish investigators will benefit from the use of x-ray sources unavailable in their country, and the U.S. investigators will benefit from Swedish expertise in instrumentation. Results of this work may have important long-range benefits by enabling us to increase our understanding of astrophysical phenomena through laboratory experiments, and also by facilitating the production of ion beams suitable for microfabrication and other experimental purposes.