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

该奖项将支持诺克斯维尔田纳西大学的Ivan A. Sellin教授、隆德大学的Sven Huldt教授、瑞典斯德哥尔摩Atomfysik研究所的Anders Barany博士以及这些机构的其他人之间的合作研究。这些物理学家将研究极低能离子的产生和使用，包括它们在天体物理现象的实验室模拟中的应用。此外，理论研究将低能离子捕获电子，以及这些离子与金属表面的相互作用。塞林博士和他的瑞典同事早期的合作研究表明，x射线撞击可以产生低能离子；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。这项研究将集中于确定由x射线撞击形成的低能离子的附加特性；关于开发生产此类离子的其他方法；并为它们的使用开发实验技术。美国和瑞典的合作者在这一领域拥有共同的设备和技术元素，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速率和温度。瑞典调查人员将受益于使用本国无法获得的x射线源，而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有重要的长远利益，使我们能够通过实验室实验增加我们对天体物理现象的理解，也有助于生产适合微加工和其他实验目的的离子束。

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.