Precise studies on resonant energies of the first intershell (KLL) dielectronic recombination processes for He- up to O-like xenon

Abstract

Articles you may be interested inCorrelation consistent basis sets for explicitly correlated wavefunctions: Pseudopotential-based basis sets for the post-d main group elements Ga-Rn Precise studies of the resonant energies of KLL dielectronic recombination ͑DR͒ processes of He-, Li-, Be-, B-, C-, N-, and O-like xenon ions were performed at the Shanghai Electron Beam Ion Trap ͓X. Zhu et al., Nucl. Instrum. Methods Phys. Res. B 235, 509 ͑2005͔͒, employing home developed high precision, high stability high voltage dividers. Influences from retardation by the capacitor of experimental setup, contact potential, space charge of the electron beam, and of ion neutralization, as well as fringing field effects were taken into account. The obtained resonant energies were, at an average uncertainty level of 0.03%, compared with calculation results by relativistic configuration interaction ͑RCI͒ theory, relativistic many-body perturbation theory ͑RMBPT͒, and by multiconfiguration Dirac-Fock ͑MCDF͒ theory. All the three predicted DR resonant energies by MCDF agree with our experiments. Among the 15 predictions by RMBPT, 13 are in good agreement with our experimental results. But only five out of 15 predictions by RCI calculation agree with our experimental results.

KLLdielectronic recombination resonant strengths of He-like up to O-like xenon ions

“…By using EBIT/EBIS, DR of He-like ions was studied for many species: argon [19][20][21][22], iron [23,24], germanium [25], titanium [26], nickel [27], molybdenum, and barium [28]. DR for other open L-shell ions has been studied (e.g., for holmium and bismuth [29], krypton [30], iodine [29,31], and xenon [32,33]). Also the iso-electronic sequences of H-like [34], F-like [35], and Ne-like ions [36,37] have been studied.…”

“…Experimental studies with a good level of precision are very much required to test the theories. In our previous work, resonant energies and resonance strengths for KLL DR of open L-shell Xe ions were studied by measuring the stabilizing X ray while scanning the electron beam energy in a steady-state mode [32,33]. We could determine the resonant energies for He-like up to O-like Xe ions at an average accuracy level of 0.03% [33], with the help of a homemade precise and highly stable high-voltage divider [38].…”

“…In our previous work, resonant energies and resonance strengths for KLL DR of open L-shell Xe ions were studied by measuring the stabilizing X ray while scanning the electron beam energy in a steady-state mode [32,33]. We could determine the resonant energies for He-like up to O-like Xe ions at an average accuracy level of 0.03% [33], with the help of a homemade precise and highly stable high-voltage divider [38]. But for the resonance strength studies [33], we could only make measurements for Be-, B-, and C-like Xe ions, and even then with uncertainties between 15% and 20%.…”

“…We could determine the resonant energies for He-like up to O-like Xe ions at an average accuracy level of 0.03% [33], with the help of a homemade precise and highly stable high-voltage divider [38]. But for the resonance strength studies [33], we could only make measurements for Be-, B-, and C-like Xe ions, and even then with uncertainties between 15% and 20%. This is mainly because in the steady-state mode we have less control over the charge state distribution of the ions.…”

Leaky ion extraction method for dielectronic recombination strength measurements at electron-beam ion traps

“…In high-Z ions with few electrons, higher electron-ion collision energies * Zouym@fudan.edu.cn are needed for n > 0 DR processes, especially for those involving K-shell electron excitation. EBIT and EBIS are commonly employed in these cases [10][11][12][13][14][15][16][17][18][19][20][21][22].…”