Many-Body Effects in the Photoionization Process, US-Turkey Cooperative Research

本项目支持亚特兰大佐治亚州立大学物理系Steven Manson博士和土耳其伊斯坦布尔马尔马拉大学物理系Zikri Altun博士之间的合作。本研究涉及两个领域：第一，利用多体微扰理论（MBPT）研究开壳层原子的光电离，特别强调了非常困难的过渡金属和稀土元素，通过研究第3过渡金属原子的光电离截面中所谓的巨共振周围的区域；第二，闭合壳层原子的激发光电离，其中光电子能谱测量的实验结果显示了许多部分截面，其关系难以评估，其中这些截面的计算将有助于理解这种重要的相关性。范围：该项目将允许大约两年前开始的合作活动再持续两年，并从合作中产生最大的利益。这位美国科学家的研究小组在光电离理论方面有丰富的经验，并拥有大量的大规模计算设备。这位土耳其科学家对他的论文导师和导师开发的MBPT代码有相当多的了解，并且在他的部门也有代码开发和测试的设施。这两位科学家在头两年已经取得了相当大的成功，在科学会议上发表了几篇论文，并提交了至少一篇联合论文发表。在项目延期期间，他们可能会发表更多的论文。该项目显然符合国际项目司的目标，即在人才和能力互补的情况下，将美国科学家与外国科学家联系起来。

Description: This project supports cooperation between Dr. Steven Manson, Physics Department at Georgia State University, Atlanta, and Dr. Zikri Altun, Physics Department at Marmara University in Istanbul, Turkey. The research deals with two areas: first, the photoionization of open-shell atoms using many-body perturbation theory (MBPT) with particular emphasis on the very difficult transition metals and rare earth elements, by investigating the region around the so-called giant resonances in the photoionization cross sections of the 3rd transition metal atoms; and second, the photoionization with excitation of closed-shell atoms, where the experimental results of photoelectron spectroscopy measurements display many partial cross sections whose relationships are difficult to evaluate, and where the calculation of these cross sections will help understand this important correlation. Scope: This project will allow a cooperative activity that has started about two years ago to continue for an additional two years, and to produce maximum benefits from the collaboration. The US scientist's group is well established, is experienced in the photoionization theory, and has extensive facilities for large-scale calculations. The Turkish scientist has considerable knowledge of the MBPT codes, developed by his thesis advisor and mentor, and also has the facility for code development and testing at his department. The two scientists have already accomplished considerable success in the first two years, presented several papers at scientific meetings, and have submitted at least one joint paper for publication. They are likely to produce more papers during the period of this project extension. The project clearly meets the objectives of the Division of International Programs in linking US scientists with foreign scientists where the talents and capabilities are complementary.