Electron-impact recombination and excitation rates for charge-state-selected highly charged Si ions

Lindroth, Eva; Orbán, Istvan; Trotsenko, S.; Schuch, R.

doi:10.1103/physreva.101.062706

Cited by 9 publications

(8 citation statements)

References 32 publications

(46 reference statements)

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“…Continuing those works, we focus on the DR 3l3l (LMM) satellites of Fe XVII, and provide experimental resonant strengths and rate coefficients. Similar measurements were previously done for Au (Schneider et al 1992), Xe (DeWitt et al 1992), and more recently for Si (Lindroth et al 2020). In this work, we remeasured previously studied Fe XVII LMM region by our group (see Shah et al (2019)) with another electron beam ion trap (EBIT), PolarX-EBIT (described in Micke et al (2018)).…”

Section: Introductionsupporting

confidence: 82%

Comprehensive Laboratory Measurements Resolving the LMM Dielectronic Recombination Satellite Lines in Ne-like Fe xvii Ions

Grilo

Shah

et al. 2021

ApJ

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We investigated experimentally and theoretically dielectronic recombination (DR) populating doubly excited configurations (LMM) in Fe xvii, the strongest channel for soft X-ray line formation in this ubiquitous species. We used two different electron beam ion traps and two complementary measurement schemes for preparing the Fe xvii samples and evaluating their purity, observing negligible contamination effects. This allowed us to diagnose the electron density in both EBITs. We compared our experimental resonant energies and strengths with those of previous independent work at a storage ring as well as those of configuration interaction, multiconfiguration Dirac–Fock calculations, and many-body perturbation theory. This last approach showed outstanding predictive power in the comparison with the combined independent experimental results. From these we also inferred DR rate coefficients, unveiling discrepancies from those compiled in the OPEN-ADAS and AtomDB databases.

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Section: Introductionsupporting

confidence: 82%

Comprehensive Laboratory Measurements Resolving the LMM Dielectronic Recombination Satellite Lines in Ne-like Fe xvii Ions

Grilo

Shah

et al. 2021

ApJ

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“…Taking into account all feeding and loss channels, a consistent description of the charge balances of the ions after probing could be obtained by solving the rate equations for the different electron energies. The solutions of the rate equations are treated in detail in [14] for S and [15] for Si. By employing the number of ions obtained from TOF measurements in rate equations, the E e -dependent electron-ion recombination rate coefficients are obtained for the individual charge states.…”

Section: Resultsmentioning

confidence: 99%

“…And, after the probing time, the ions were extracted by a ns voltage pulse from a Behlke switch and sent along a flight path of 3 m. Then the extracted ions were detected by a fast (>ns rise time) open electron multiplier. For each extraction, the probing energy and the digitized TOF spectrum containing the six highest charge states of Si or S were saved [14,15]. A schematic of the S-EBIT operation and data taking system for the coupled photon detection and TOF measurement is shown in figure 1.…”

Section: Methodsmentioning

confidence: 99%

Excitation and recombination studies with silicon and sulphur ions at an EBIT

Orban,

Mahmood,

Fritjof

et al. 2024

J. Phys. B: At. Mol. Opt. Phys.

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Measurements of electron-impact excitation and recombination rate coefficients of highly charged Si and S ions at the Stockholm Electron Beam Ion Trap (S-EBIT) are reported. The experimental method was a combination of photon detection from the trapped ions during probing and subsequently extraction and time-of-flight (TOF) charge analysis of these ions. The TOF technique allows to measure recombination rate coefficients separately for every charge state, and together with the photon spectra of these ions also the excitation rate coefficients. In this paper, we present more details of the experimental procedure and summarize the experimental results in comparison with two different state-of-the-art calculations of recombination and excitation rates for Si10+-Si13+ and S12+-S15+ ions. One of these uses a relativistic configuration interaction approach (Flexible Atomic Code, FAC) and the other is a relativistic many-body perturbation theory (RMBPT). A good to excellent agreement with both of them is found in energy and resonance strength for the investigated ions.

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“…The observation of DR resonances has been done frequently in EBIT devices with HCI. To name a few examples, there are reports of observations of K-LL and L-MM in gold [15,16], K-LL of several charge states of xenon [17], K-LL in H-like krypton [18], K-Ln of several charge states of silicon [19] and L-Mn of Ne-like iron [20][21][22]. In this work, we observed the L-Mn resonant structure of Ce 33+ to Ce 41+ with n = M, N, O.…”

Section: Introductionmentioning

confidence: 99%

L-Mn dielectronic recombination of cerium ions in a room-temperature EBIT

Biela-Nowaczyk,

Grilo,

Amaro

et al. 2024

J. Phys. B: At. Mol. Opt. Phys.

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We explore the Dielectronic Recombination structures at the Electron Beam Ion Trap at Jagiellonian University in Cracow, emited by cerium that is produced by the high-current cathode made of iridium and cerium. Small amounts of these elements evaporate from the cathode and form low-intensity admixtures within the electron-ion plasma in the EBIT. Their presence and specific ionic population can be observed by examining the spectral characteristics resulting from the DR process. Results have been compared with Flexible Atomic Code calculations, working in Unresolved Transition Array mode, providing identification of the charge states. Here we show that this mode provides quick calculations of very complex data with enough reliability for experimental comparison. These observations highlight which DR features and corresponding charge states that should be present in spectra obtained in EBITs with similar cathode specifications.

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Electron-impact recombination and excitation rates for charge-state-selected highly charged Si ions

Cited by 9 publications

References 32 publications

Comprehensive Laboratory Measurements Resolving the LMM Dielectronic Recombination Satellite Lines in Ne-like Fe xvii Ions

Comprehensive Laboratory Measurements Resolving the LMM Dielectronic Recombination Satellite Lines in Ne-like Fe xvii Ions

Excitation and recombination studies with silicon and sulphur ions at an EBIT

L-Mn dielectronic recombination of cerium ions in a room-temperature EBIT

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