Energy Levels and Observed Spectral Lines of Ionized Argon, ArII through ArXVIII

Saloman, E. B.

doi:10.1063/1.3337661

Cited by 97 publications

(54 citation statements)

References 214 publications

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“…Energies and assignments for the lowest 14 levels of the Ar iii system presented in eV. Stancalie et al (2012) and Munoz Burgos et al (2009) are theoretical R-matrix results for electron impact excitation calculations, and the NIST results are observational data taken from Saloman (2010). The remaining results are the present works summarized in Table 1.…”

Section: Relativistic Approachmentioning

confidence: 86%

“…We directly compare the ab initio energies from the PBP, DARC1, DARC2 and DARC3 evaluations with two theoretical R-matrix works (Stancalie et al 2012;Munoz Burgos et al 2009), both of which performed electron-impact excitation evaluations and generated their basis set for Ar iii with the autostructure (Badnell 1986), adapted from the original superstructure (Eissner et al 1974), computer package. Comparisons are also made with the recorded NIST levels compiled by Saloman (2010) which incorporates designations from observed spectral analysis of existing works.…”

Section: Relativistic Approachmentioning

confidence: 99%

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Valence and L-shell photoionization of Cl-like argon using R-matrix techniques

Tyndall

Ramsbottom

Ballance

et al. 2015

Mon. Not. R. Astron. Soc.

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Photoionization cross sections are obtained using the relativistic Dirac Atomic Rmatrix Codes (darc) for all valence and L-shell energy ranges between 27-270eV. A total of 557 levels arising from the dominant configurations 3s 2 3p 4 , 3s3p 5 , 3p 6 , 3s 2 3p 3 [3d, 4s, 4p], 3p 5 3d, 3s 2 3p 2 3d 2 , 3s3p 4 3d, 3s3p 3 3d 2 and 2s 2 2p 5 3s 2 3p 5 have been included in the target wavefunction representation of the Ar iii ion, including up to 4p in the orbital basis. We also performed a smaller Breit-Pauli (bp) calculation containing the lowest 124 levels. Direct comparisons are made with previous theoretical and experimental work for both valence shell and L-shell photoionization. Excellent agreement was found for transitions involving the 2 P o initial state to all allowed final states for both calculations across a range of photon energies. A number of resonant states have been identified to help analyze and explain the nature of the spectra at photon energies between 250 and 270eV.

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Section: Relativistic Approachmentioning

confidence: 86%

Section: Relativistic Approachmentioning

confidence: 99%

Valence and L-shell photoionization of Cl-like argon using R-matrix techniques

Tyndall

Ramsbottom

Ballance

et al. 2015

Mon. Not. R. Astron. Soc.

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“…Some of the calculated values with Z = 11−18 have been corrected by several cm −1 (Martin & Zalubas 1981Martin et al 1985;Saloman 2010), while values with Z ≥ 22 are presented without correction. However, Fig.…”

Section: Energy Levelsmentioning

confidence: 99%

Energy levels and transition rates for helium-like ions withZ = 10–36

Guo

Wang

et al. 2016

A&A

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Aims. Helium-like ions provide an important X-ray spectral diagnostics in astrophysical and high-temperature fusion plasmas. An interpretation of the observed spectra provides information on temperature, density, and chemical compositions of the plasma. Such an analysis requires information for a wide range of atomic parameters, including energy levels and transition rates. Our aim is to provide a set of accurate energy levels and transition rates for helium-like ions with Z = 10-36. Methods. The second-order many-body perturbation theory (MBPT) was adopted in this paper. To support our MBPT results, we performed an independent calculation using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method. Results. We provide accurate energies for the lowest singly excited 70 levels among 1snl (n ≤ 6, l ≤ (n − 1)) configurations and the lowest doubly excited 250 levels arising from the K-vacancy 2ln l (n ≤ 6, l ≤ (n − 1)) configurations of helium-like ions with Z = 10−36. Wavelengths, transition rates, oscillator strengths, and line strengths are calculated for the E1, M1, E2, and M2 transitions among these levels. The radiative lifetimes are reported for all the calculated levels. Conclusions. Our MBPT results for singly excited n ≤ 2 levels show excellent agreement with other elaborate calculations, while those for singly excited n ≥ 3 and doubly excited levels show significant improvements over previous theoretical results. Our results will be very helpful for astrophysical line identification and plasma diagnostics.

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“…Saloman [60][61][62] and an extension and new level optimization of the Ne IV spectrum, that includes our line identification on this gas, was recently made by A. Kramida [63]. Also our previous results a new Kr IV-VII oscillator strengths and an improved spectral analysis of the hot, hydrogen-deficient DO-type white dwarf RE 0503-289, and a new Zr IV-VII, Xe IV-V, and Xe VII oscillator strengths and the Al, Zr, and Xe abundances in the hot white dwarfs G191-B2B and RE 0503-289 were very recently reported [64,65].…”

Section: Discussionmentioning

confidence: 99%

Spectral Analysis of Moderately Charged Rare-Gas Atoms

Almandos

Raineri

2017

Atoms

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This article presents a review concerning the spectral analysis of several ions of neon, argon, krypton and xenon, with impact on laser studies and astrophysics that were mainly carried out in our collaborative groups between Argentina and Brazil during many years. The spectra were recorded from the vacuum ultraviolet to infrared regions using pulsed discharges. Semi-empirical approaches with relativistic Hartree-Fock and Dirac-Fock calculations were also included in these investigations. The spectral analysis produced new classified lines and energy levels. Lifetimes and oscillator strengths were also calculated.

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Energy Levels and Observed Spectral Lines of Ionized Argon, ArII through ArXVIII

Cited by 97 publications

References 214 publications

Valence and L-shell photoionization of Cl-like argon using R-matrix techniques

Valence and L-shell photoionization of Cl-like argon using R-matrix techniques

Energy levels and transition rates for helium-like ions withZ = 10–36

Spectral Analysis of Moderately Charged Rare-Gas Atoms

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