Stark shift and width of x-ray lines from highly charged ions in dense plasmas

Gu, M. F.; Beiersdörfer, P.

doi:10.1103/physreva.101.032501

Cited by 14 publications

(4 citation statements)

References 23 publications

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“…Their transition probabilities and level lifetimes span many orders of magnitude, and their energies are far more stable than other standards. This is true under all for our device con-ceivable values of temperature and electron density -e. g., extrapolating from [53] for an electron-density effect on K β (1s -3p) of He-like Cl in an EBIT yields a shift lower than 1 neV -and recommends them as inherently superior references. Furthermore, since space observatories often use naturally occurring HCI transitions for calibration, comparing them with the identical ones from an EBIT is straightforward.…”

mentioning

confidence: 99%

High-Precision Determination of Oxygen Kα Transition Energy Excludes Incongruent Motion of Interstellar Oxygen

Leutenegger¹,

Kühn²,

Micke³

et al. 2020

Phys. Rev. Lett.

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We demonstrate a widely applicable technique to absolutely calibrate the energy scale of x-ray spectra with experimentally well-known and accurately calculable transitions of highly charged ions, allowing us to measure the K-shell Rydberg spectrum of molecular O2 with 8 meV-uncertainty. We reveal a systematic ∼450 meV shift from previous literature values, and settle an extraordinary discrepancy between astrophysical and laboratory measurements of neutral atomic oxygen, the latter being calibrated against the aforementioned O2 literature values. Because of the widespread use of such, now deprecated, references, our method impacts on many branches of x-ray absorption spectroscopy. Moreover, it potentially reduces absolute uncertainties there to below the meV level.

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mentioning

confidence: 99%

High-Precision Determination of Oxygen Kα Transition Energy Excludes Incongruent Motion of Interstellar Oxygen

Leutenegger¹,

Kühn²,

Micke³

et al. 2020

Phys. Rev. Lett.

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“…Until recently, discrepancies had been observed between the measurements and existing theories for continuum lowering and line shifts [44,53]. More recent studies have apparently removed most of these discrepancies [47,55]. The measured redshifts of the Kr Heβ peak, as observed in figure 5 and as quantified by the centroid of the peak taken from thresholds of 90% of peak height on both the left and the right sides of the peak, range from about 6 eV to 12 eV, and increase with inferred densities in the range 1.8-4.0 × 10 24 cm −3 .…”

Section: Kr Heb Line Shiftsmentioning

confidence: 99%

Study of Stark broadening of krypton helium-β lines and estimation of electron density and temperature in NIF compressed capsules

Hill¹,

Gao²,

Kraus³

et al. 2022

Plasma Phys. Control. Fusion

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The National Ignition Facility (NIF) dHIRES x-ray spectrometer was used to measure the time evolution of the electron density (ne) and temperature (Te) in the hot spot of four NIF compressed capsules with 25 ps time resolution during the “stagnation” phase. The electron density was inferred by comparing the measured Stark broadening of the krypton (Kr) Heβ spectral complex with theoretical calculations that include ion dynamic effects, and the electron temperature was inferred by comparing the measured ratio of the intensity of a dielectronically excited Li-like Kr line to the intensity of the Kr Heβ resonance line with calculations using the SCRAM and CRETIN collisional-radiative models. The inferred, time averaged ne values mainly agree with ne values from neutron diagnostics within uncertainties, but the neutron time-of-flight values of Tion are consistently higher than dHIRES Te values by 200 – 700 eV. The dHIRES measurements and measurement techniques, method of uncertainty analysis, and discussion of comparisons with measurements from neutron diagnostics are presented.

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“…The addition of the Debye screening between the atomic electrons not only would need substantially additional calculational efforts in the theoretical studies, it actually leads to the spurious result such as the only loosely two-electron bound state of the H − ion would remain bound in the presence of the outside dense plasma [20]. In addition, we have also pointed out recently that by falsely including an extra factor of (Z e f f + 1) in the Debye length (i.e., assuming the effect of the Debye screening due to the slowly moving outside ions), the resulting estimation of the energy shifts from the DH approximation could be an order of magnitude larger than what it actually is [21,22].…”

Section: Introductionmentioning

confidence: 96%

Energy Shift of the Atomic Emission Lines of He-like Ions Subject to Outside Dense Plasma

Chang,

Fang,

Sun

et al. 2024

Atoms

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We present an extension of our study of the energy shift of the atomic emissions subject to charged-neutral outside dense plasma following the good agreement between the experimental measurements and our recent theoretical estimates for the α and β emission lines of a number of H-like and He-like ions. In particular, we are able to further demonstrate that the plasma-induced transition energy shift could indeed be interpolated by the simple quasi-hydrogenic picture based on the application of the Debye–Hückel (DH) approximation for the n=3 to n=2 transitions of the He-like ions. Our theoretically estimated redshifts of those emissions may offer the impetus for additional experimental measurement to facilitate the diagnostic efforts in the determination of the temperature and density of the dense plasma.

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Stark shift and width of x-ray lines from highly charged ions in dense plasmas

Cited by 14 publications

References 23 publications

High-Precision Determination of Oxygen Kα Transition Energy Excludes Incongruent Motion of Interstellar Oxygen

High-Precision Determination of Oxygen Kα Transition Energy Excludes Incongruent Motion of Interstellar Oxygen

Study of Stark broadening of krypton helium-β lines and estimation of electron density and temperature in NIF compressed capsules

Energy Shift of the Atomic Emission Lines of He-like Ions Subject to Outside Dense Plasma

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