Dielectronic recombination in He-like, Li-like, and Be-like highly charged ions in theKLLandKLMmanifolds

Abstract

This paper reports a systematic study of the dependence on atomic number of the dielectronic recombination resonance strengths for He-like, Li-like and Be-like ions. Recent measurements of dielectronic recombination resonance strengths for the KLL and KLM manifolds for iron, yttrium, iodine, holmium, and bismuth are also described. The resonance strengths were normalized to calculated electron impact ionization cross sections. The measured resonance strengths generally agree well with theoretical calculations using the distorted wave approximation. However, KLM resonance strength measurements on high atomic number open-shell ions gave higher values than those suggested by calculations. Using recently measured data, along with existing results, scaling laws have been generated as a function of atomic number for He-like, Li-like, and Be-like ions in the KLL and KLM manifolds.

Major role of multielectronicK-Lintershell resonant recombination processes in Li- to O-like ions of Ar, Fe, and Kr

“…For high Z values, in the case of DR, the fluorescence yield is dominated by the radiative decay and thus it approaches unity, whereas for small Z it is governed by the Auger rate, see following scaling law for the strength [34,35]:…”

Atomic-number dependence of the magnetic-sublevel population in the autoionization state formed in dielectronic recombination

“…The experimental method and procedure are similar to those used in our previous study [20], where the combination of the integral cross-section measurement through observing ionabundance ratios inside the trap [29,34,35] and the differential cross section measurement through x-ray observation at 90 • [36,37] was used to obtain the angular distribution of the x rays emitted in DR of Li-like Au (Z = 79). In addition to the previous result, Pr (Z = 59) and Ho (Z = 67) were examined in the present study to investigate the Z dependence.…”

“…The experimental method for the ion-abundance measurement is described in detail in our previous papers [29,34,35]. Briefly, the electron energy was stepwise scanned over the KL 12 L 12 resonance [20] region by changing the potential at the cathode of the electron gun.…”

Angular correlations in radiative cascades following resonant electron capture by highly charged ions

“…Moreover, DR studies play an important role in understanding the quantum electrodynamic (QED), many-electron, or even hyperfineinteraction effects in heavy atomic systems [8][9][10][11]. In order to probe these effects, a large number of DR experiments have been performed at storage ring and electron-beam ion-trap (EBIT) facilities for various charge states of ions and collision energies [12][13][14][15].…”