论文标题
高度激发自动化的rydberg状态的孤立核心四极激励
Isolated-core quadrupole excitation of highly excited autoionizing Rydberg states
论文作者
论文摘要
在Sr $^+（n = 5）$阈值附近研究了具有高角度矩的标的高躺式激发态的结构和光激发动力学。基于与外部复合体缩放缩放的构型相互作用，通过计算分析了使用谐振多光子分离的核心激发记录的光谱，该计算从第一原理中处理了SR的两个价电子的相关运动。基于多通道量子缺失理论和过渡偶极矩的模型合理化了结果，该模型通过电子相关性的扰动处理计算出来。两种方法共同揭示了在光谱中观察到的大多数线是由单个光学活性状态的相互作用引起的，并通过电 - 偶极转变耦合到初始状态，并带有整个双重激发的Rydberg系列。负责这种相互作用的远程电子相关性意外地消失了初始和最终主量子数的相同值，这是与高$ l $ rydberg电子的准氢化性质有关的事实。这种特殊的情况，尤其是消失的相互作用，导致了对电\ emph {Quadrupole}孤立的激发的令人惊讶的观察，其强度与相邻的电偶极转变相似。
The structure and photoexcitation dynamics of high lying doubly excited states of the strontium atom with high angular momenta are studied in the vicinity of the Sr$^+(N=5)$ threshold. The spectra recorded using resonant multiphoton isolated core excitation are analyzed with calculations based on configuration interaction with exterior complex scaling, which treats the correlated motion of the two valence electrons of Sr from first principles. The results are rationalized with a model based on multichannel quantum-defect theory and transition dipole moments calculated with a perturbative treatment of electron correlations. Together, both approaches reveal that most of the lines observed in the spectra arise from the interaction of a single optically active state, coupled to the initial state by an electric-dipole transition, with entire doubly-excited Rydberg series. The long-range electron correlations responsible for this interaction unexpectedly vanish for identical values of the initial and final principal quantum numbers, a fact related to the quasi hydrogenic nature of the high-$l$ Rydberg electron. This special situation, and in particular the vanishing interaction, leads to the surprising observation of an electric \emph{quadrupole} isolated-core excitation with a similar intensity as the neighboring electric dipole transitions.
