Kα X-ray emission spectra from highly charged Fe ions in EBIT

Jacobs, V. L.; Beiersdörfer, P.

doi:10.1139/p07-104

Cited by 3 publications

(2 citation statements)

References 42 publications

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“…X-ray lines from Fe XXII due to K α (1s-2p) and K β (1s-3p) transitions can be observed in high temperature magnetic fusion (toka-mak) plasmas and can serve in diagnostics of extreme nonequilibrium or transient ionization conditions [7]. Table G presents the A values for such emissions.…”

Section: Energies and Forbidden E2 E3 M1 M2 Transitions From Supermentioning

confidence: 99%

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Allowed and forbidden transition parameters for Fe XXII

Nahar

2010

Atomic Data and Nuclear Data Tables

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Radiative transitions for photo-excitations and de-excitations in Fe XXII are studied in the relativistic Breit-Pauli approximation. A comprehensive set of fine structure energy levels, oscillator strengths (f), line strengths (S), and radiative decay rates (A) for electric dipole (E1), same spin multiplicity and intercombination, fine structure transitions is presented. These are obtained from the first calculations in the close coupling approximation using the Breit-Pauli R-matrix method for this ion, all existing theoretical results having been obtained from various other atomic structure calculations. The present work obtains a set of 771 fine structure energy levels with n < 10, l < 9, and 1/2 < J < 17/2, only 52 of which have been observed. The f, S, and A values are reported for 70,372 allowed E1 transitions, exceeding by far those published previously. The calculated fine structure levels have been identified spectroscopically using a procedure based on quantum defect analysis. The energies agree with the available observed energies to within less than one to a few percent. The A values for E1 transitions are in good agreement with other existing values for most transitions. Using the atomic structure code SUPERSTRUCTURE (SS), S and A values are also presented for 38,215 forbidden transitions of the types electric quadruple (E2), electric octupole (E3), magnetic dipole (M1), and magnetic quadrupole (M2) among 274 fine structure levels formed from 25 configurations with orbitals ranging from 1s to 4f. Some of these levels lie above the ionization limit and hence can form autoionizing lines. Such lines for 1s-2p K α transitions have been observed in experiments. The energies from the SS calculations agree with observed energies within a few percent. The A values for E2 and M1 transitions agree very well with the available values. The atomic parameters for both allowed and forbidden transitions should be applicable for diagnostics as well as complete spectral modeling in the X-ray, ultraviolet, and optical regimes of astrophysical and laboratory plasmas.

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Section: Energies and Forbidden E2 E3 M1 M2 Transitions From Supermentioning

confidence: 99%

“…Lines of Fe XXII have also been studied in the laboratory plasmas (e.g., Refs. [6,7]). Identification and analysis of these spectra require accurate parameters, such as energy levels and oscillator strengths, as presented here.…”

Section: Introductionmentioning

confidence: 99%

Allowed and forbidden transition parameters for Fe XXII

Nahar

2010

Atomic Data and Nuclear Data Tables

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Allowed and forbidden transition parameters for Fe XV

Nahar

2009

Atomic Data and Nuclear Data Tables

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A comprehensive set of fine structure energy levels, oscillator strengths (f), line strengths (S), and radiative decay rates (A) for bound-bound transitions in Fe XV is presented. The allowed electric dipole (E1) transitions were obtained from the relativistic Breit-Pauli R-matrix method which is based on the close coupling approximation. A total of 507 fine structure energy levels with n ≤ 10, l ≤ 9, and 0 ≤ J ≤ 10 are found. They agree within 1% with the available observed energies. These energy levels yield a total of 27,812 E1, same-spin multiplets and intercombination transitions. The A values are in good agreement with those compiled by NIST and other existing values for most transitions. Forbidden transitions are obtained from a set of 20 configurations with orbitals ranging from 1s to 5f using the relativistic code SUPERSTRUCTURE (SS) in the Breit-Pauli approximation. From a set of 123 fine structure levels, a total of 6962 S and A values are presented for forbidden electric quadrupole (E2), electric octupole (E3), magnetic dipole (M1), and magnetic quadrupole (M2) transitions. The energies from SS calculations agree with observed energies to within 1-3%. A values for E2, M1 transitions agree very well with the available values for most transitions while those for M2 transitions show variable agreement. The large set of transition parameters presented should be applicable for both diagnostics and spectral modeling in the X-ray, ultraviolet, and optical regions of astrophysical plasmas.

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Lineshape measurements of He-β spectra on the ORION laser facility

et al. 2016

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We have utilized a newly developed high-resolution X-ray spectrometer to measure the shapes of spectral lines produced from laser-irradiated targets on the Orion laser facility in the United Kingdom. We present measurements of the He-β spectra of chlorine and chromium from targets irradiated by either a long-pulse or a short-pulse laser beam. The experimental conditions provide a spread in plasma density ranging from about 1019 to about 1024 cm−3. We present spectral calculations that show that the relative intensities of the Li-like satellite lines can be used to infer the density in the lower range, especially if the lithiumlike satellite lines are well resolved. In addition, we use the Stark-broadened width of the He-β line to infer densities above about 1022 cm−3. In the case of a short-pulse irradiated chromium foil, we find that the He-like chromium is produced at a density of almost 8 g/cm3, i.e., solid density. In addition, we can infer the electron temperature from the observation of dielectronic recombination satellite lines.

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Kα X-ray emission spectra from highly charged Fe ions in EBIT

Cited by 3 publications

References 42 publications

Allowed and forbidden transition parameters for Fe XXII

Allowed and forbidden transition parameters for Fe XXII

Allowed and forbidden transition parameters for Fe XV

Lineshape measurements of He-β spectra on the ORION laser facility

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