Energies, Auger and radiative probabilities of the doubly-excited 1s23l3l′ states for Be-like neon

K-shell photoionization of Be-like nitrogen from the ground state: energies and Auger widths of the high-lying double-excited states for N IV

“…Table 7. The 1s2s2p( 3 P) 2 P ns 1 P and 1s2s2p( 3 P) 2 P nd 1 P of N IV: energies E r (Ry) (relative to the 1s 2 2s 1 S of N IV), quantum defect µ ,widths Γ (Ry) 1s2s2p( 3 P) 2 P ns 1 P 1s2s2p( 3 P) 2 P and from 1s2s2p( 3 P) 2 P to 1s2s2p( 1 P) 2 P ionization threshold respectively, of which process corresponds to a 1s electron excited from the ground state 1s 2 2s 2 1 S to 2p and a 2s electron excited to ns or nd, forming the 1s2s2p 2 P ns 1 P and 1s2s2p 2 P nd 1 P series, respectively. In addition, there are low excited resonance states of 1s2s2p( 1 P) 2 P ns,nd 1 P and 1s2p 2 2 D np, nf 1 P series occur in the energy range of Figure 5 and some excited resonance states of 1s2p 2 2 D np, nf 1 P in the energy range of Figure 6 respectively.…”

“…Due to the photoionization of the Be-like ions offers an opportunity to study electron correlation of the simplest multishell atom and ions, a large number of studies such as PI cross sections, energies and widths of doubly-excited states and oscillator strengths for the beryllium isoelectronic sequence have been made in the past few decades [1][2][3][4][5][6][7][8].…”

From atoms to biomolecules: a fruitful perspective

“…Double capture is by far the most studied experimentally and theoretically [161] mainly because of the possibility to also reach those doubly-excited states radiatively from the ground state [16,62]. Note that this research area is still very active, as illustrated by the recent reinvestigation of our pioneer work [161] on radiative transition probabilities and Auger rates of the 1s 2 3'3' 0 states in Be-like ions [147]. The capture of three electrons from the neutral target into triply excited states is also possible but the analysis of the resulting electron spectra is much more complicated due to the complexity of the Auger decay cascade of the triply excited states.…”