RUI: Relaxation and Polarization Effects in the Photoionization of Atoms

当紫外线或软x射线辐射照射气体时，光粒子（光子）有可能被原子吸收，从而产生电子（光电子）的发射。这个过程称为光电离。它可以用来探测原子的电子结构和各种原子电子之间的相互作用。这里将研究这些相互作用的理论，特别是原子深处的电子。要研究的一个问题是核心弛豫，即光电子离开原子后剩余电子的重新排列。另一个问题是核心极化，即在离开的光电子存在下剩余电子排列的变化。

When ultraviolet light or soft x-ray radiation is used to illuminate a gas, it is possible for light particles (photons) to be absorbed by atoms, resulting in the emission of electrons (photoelectrons). This process is termed photoionization. It can be used to probe the electron structure of atoms and the interactions among the various atomic electrons. Here the theory of these interactions will be investigated, especially for electrons lying deep within the atom. One problem to be studied is core relaxation, the rearrangement of the remaining electrons in the atom after the departure of the photoelectron. Another problem is core polarization, the change in the arrangement of the remaining electrons in the presence of the departing photoelectron.