State-selective quantum interference observed in the photorecombination of ions at the Heidelberg EBIT

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

“…It is possible to measure photons emitted from the trapped ions as the electron beam is varied to deduce DR resonance strengths. The energy region of interest can be scanned by using either a slow [11] or a rapid scan [12,13] of the energy of the electron beam. As an alternative to using photons, DR resonance strengths can also be measured by using ions extracted from an EBIT.…”

State‐selected photo‐recombination cross sections of H‐like ions in the KLL resonant energy range

“…Recently, the quantum interference effects have been observed in atomic collisions process and attracted considerable interest. For examples, the interference effects have been found to occur between two photo‐electrons which emitted from a single photoionization process [2–5] as well as between some direct and indirect atomic processes involved in the electron‐ion recombination [6–11] and photon‐ion ionization [12]. In the plasma environment, PR is an important recombination process and has gained significant attention in interferometry studies.…”

“…In Knapp et al research [6], they detected the characteristic spectral signatures of PR in highly charged uranium ions at an electron‐beam ion trap (EBIT). Furthermore, the quantum interference effects in the PR spectra were observed in the highly charged He‐like through B‐like Hg ions at the Heidelberg EBIT and the He‐like through B‐like Bi ions at the Tokyo EBIT [[7–9]. Other than EBIT devices, recombination experiments can also be performed in a heavy‐ion storage device with an electron cooler.…”

“…photoionization process [2][3][4][5] as well as between some direct and indirect atomic processes involved in the electron-ion recombination [6][7][8][9][10][11] and photon-ion ionization [12]. In the plasma environment, PR is an important recombination process and has gained significant attention in interferometry studies.…”

The effects of quantum interference between direct and resonant photorecombination of H-like Ar17+ions

“…Gorczyca et al [8] predicted a strongly asymmetric line shape for the Sc 3+ DR resonance caused by interference between RR and DR. Schippers et al [9] also analyzed the broad asymmetrical photorecombination profiles for Sc 3+ in a storage-ring experiment. González Martínez et al [10][11][12] performed a series of experiments to observe the state-selective quantum interference in the photorecombination of highly charged Hg 75+,•••,78+ ions at the Heidelberg EBIT, and Harman et al [13] calculated the resonance energies for KLL DR into these mercury ions by various means, such as the multiconfiguration Dirac-Fock (MCDF) and configuration interaction Dirac-Fock-Sturmian methods, and the quantum electrodynamic (QED) many-body theory. Recently, Nakamura et al [14] also observed asymmetric profiles in the recombination cross section of Be-like Bi 79+ , by measuring the electron energy dependence of the ion abundance ratio in an EBIT.…”