Superconfiguration widths and their effects on atomic models

Hansen, Stephanie B.; Bauche, J.; Bauche‐Arnoult, C.

doi:10.1016/j.hedp.2010.07.002

Cited by 22 publications

(13 citation statements)

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“…However, using such methods within hydrodynamic simulations seems difficult and somehow unrealistic (for high-Z elements). Another approach would be to modify the rates between complexes in an effective manner [39].…”

Section: Discussionmentioning

confidence: 99%

The fast non-LTE code DEDALE

Gilleron

Piron

2015

High Energy Density Physics

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Section: Discussionmentioning

confidence: 99%

The fast non-LTE code DEDALE

Gilleron

Piron

2015

High Energy Density Physics

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“…The supplemental SCs incorporate non-zero energy spreads, as described in Ref [30], to mock up a real distribution of many individual energy levels. This SC broadening is critical for obtaining reasonable CSDs in beam plasmas, since without either broadening of statistically extensive autoionization states or exhaustive calculation of zero-width fine structure states, any resonance of the DR process with the monoenergetic beam electrons is fortuitous.…”

Section: Atomic Modelingmentioning

confidence: 99%

“…[30], but it is applied to all SCs rather than just to those with ∆n = 0.) This factor is an important lever on the calculated CSDs, since it depends on the internal distribution of population within the hydrogenic SC.…”

Section: Comparison With Model Calculationsmentioning

confidence: 99%

“…The CSDs of the plasmas were simulated by SCRAM [20] using atomic physics from FAC [28,29] supplemented by hydrogenic data [30]. The simulations included collisional ionization (CI), RR, excitation-autoionization (EA) and DR. Several different simulations were done that had different treatments of DR: two included DR into high-n states using broadened hydrogenic superconfigurations [30]; one of these replaced the hydrogenic states for several of the most critical high-n DR channels with detailed configurations from FAC; and the third model excluded DR into high-n states entirely.…”

Section: Introductionmentioning

confidence: 99%

“…The simulations included collisional ionization (CI), RR, excitation-autoionization (EA) and DR. Several different simulations were done that had different treatments of DR: two included DR into high-n states using broadened hydrogenic superconfigurations [30]; one of these replaced the hydrogenic states for several of the most critical high-n DR channels with detailed configurations from FAC; and the third model excluded DR into high-n states entirely. The model that excluded DR did not match the CSDs of any of the beam plasmas, predicting CSDs that were more ionized than those recorded in the observed EBIT plasmas.…”

Section: Introductionmentioning

confidence: 99%

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Gold charge state distributions in highly ionized, low-density beam plasmas

et al. 2011

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We present a systematic study of Au charge state distributions (CSDs) from low density, nonlocal thermodynamic equilibrium plasmas created in the Livermore electron beam ion traps (EBIT-I and EBIT-II). X-ray emission from Ni-like to Kr-like Au ions has been recorded from monoenergetic electron beam plasmas having E beam = 2.66, 2.92, 3.53 and 4.54 keV, and the CSDs of the beam plasmas have been inferred by fitting the collisionally excited line transitions and radiative recombination emission features with synthetic spectra. We have modeled the beam plasmas using a collisional-radiative code with various treatments of the atomic structure for the complex M-and N-shell ions, and find that only models with extensive doubly excited states can properly account for the dielectronic recombination (DR) channels that control the CSDs. This finding would be unremarkable for plasmas with thermal electron distributions, where many such states are sampled, and the importance of DR is well established. But in an EBIT source, the beam is resonant with only a subset of such states that have spectator electrons in orbitals with high principal quantum number n (8 ≤ n ≤ 20). The inclusion in the model of such states was also necessary to obtain agreement with observed stabilizing transitions in the x-ray spectra.

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