Photoionization and Spectroscopy of Atoms and Molecules

主要活动领域将是研究卤素原子的电子动力学，包括核心电子和价电子。 卤素原子在外层p壳层中缺少一个电子，是一个原型开壳层元素，对这些原子中电子动力学的理解是在多重态水平上表征电子运动的基础。 同步辐射源和原子靶源的进步使将要进行的实验成为可能，这些进步使人们能够以前所未有的分化程度阐明电子动力学的细节。在LS多重态水平上的衰变过程的隔离是实验的常规特征，并且在J精细结构水平上的隔离将被强调，在J精细结构水平上，实验揭示了由于自旋轨道耦合而存在的显著效应。 本研究计划的总主题是研究电子相关的细节，因为它表现在开壳层和双激发原子中电子运动的动力学中。 该计划的主旨是对这些元素的研究，其中各向异性势对电子运动的影响尚未在适合于开壳层结构的详细水平上进行探讨。 拟议的实验构成了对这些复杂多体系统的现有理论预测的第一次深入检查，旨在推动更先进的理论模型的发展。 伴随的一组测量的双激发氦，原型三体系统，将补充主要的努力，和激发态亚稳原子的动力学的详细检查将为未来的研究方向奠定了基础。

The principal area of activity will be on the study of electron dynamics in the halogen atoms, both the core and the valence electrons. The halogen atom, with one missing electron in the outer p-shell, is a prototype open-shell element, and an understanding of the electron dynamics in these atoms is fundamental to the characterization of electron motion at the multiplet level. The experiments which will be carried out are made possible through advances in synchrotron radiation sources and atomic target sources which allow for the elucidation of the details of electron dynamics at an unprecedented degree of differentiation. Isolation of decay processes at the LS multiplet level are a routine feature of the experiments, and isolation at the J fine-structure level, where experiments reveal the presence of significant effects due to spin-orbit coupling, will be stressed. This research program has the general theme of studying the details of electron correlation as it is manifest in the dynamics of electron motion in open-shell and doubly excited atoms. The main thrust of the program is toward the study of those elements in which the influence of the anisotropic potential on the motion of the electrons has yet to be probed at the detailed level appropriate to an open-shell structure. The proposed experiments constitute the first indepth examination of the predictions of existing theories for these complex many-body systems and are aimed at giving impetus to the development of more advanced theoretical models. An accompanying set of measurements on the double excitations in helium, the prototype three-body system, will supplement the principal effort, and the detailed examination of dynamics of excited- state metastable atoms will set the stage for the future direction for the research.