Isolated-core quadrupole excitation of highly excited autoionizing Rydberg states

Computing Decay Widths of Autoionizing Rydberg States with Complex-Variable Coupled-Cluster Theory

“…Earlier computational studies focusing on autoionization of Rydberg states used approaches such as the close-coupling method, , R -matrix theory, , multichannel quantum defect theory, and exterior complex scaling combined with discrete variable representation. , While a treatment in terms of quantum scattering theory should be considered as the most rigorous, it is fair to say that the resonance character of Rydberg states is most often neglected in computational treatments . On the experimental side, we mention attosecond-noncollinear four-wave-mixing spectroscopy, multiphoton Rydberg-dissociation spectroscopy, ultrafast XUV/IR pump–probe spectroscopy, and synchrotron radiation , that were used to measure decays of autoionizing Rydberg states.…”