Weighted oscillator strengths and lifetimes for the Ar III spectrum

Luna, Fernando Remigio Tamariz; Bredice, F.; Cavalcanti, G. H.; Trigueiros, A. G.

doi:10.1016/s0022-4073(00)00075-3

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…A compilation of weighted oscillator strengths have been evaluated through a Multi-Configuration Hartree-Fock mchf approach in two separate cases (Luna et al 2001;Froese Fischer et al 2006). Many of these transitions are only accessible by including the 3d and n = 4 complex orbitals and retention of these are critical for subsequent calculations.…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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“…In the last few decades [13][14][15][16][17][18], there has been intense research on determining and compiling the transition probabilities of ionized argon. In the work of Burger et al [19], transition probabilities were presented for 38 Ar III and 14 Ar IV spectral lines from the wavelength interval 2400-3080 Å.…”

Section: Introductionmentioning

confidence: 99%

“…In the work of Burger et al [19], transition probabilities were presented for 38 Ar III and 14 Ar IV spectral lines from the wavelength interval 2400-3080 Å. These were compared to other papers reporting theoretical values [15,17]. In [15], Luna et al used the Cowan code [20] carried out according to the relativistic Hartree-Fock (HF) approach.…”

Section: Introductionmentioning

confidence: 99%

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Extended Analysis of Ar III and Ar IV

Raineri

Castellanos

Gallardo

et al. 2018

Atoms

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A pulsed discharge light source was used to study the two and three times ionized argon (Ar II, Ar III) spectra in the 480–6218 Å region. A set of 129 transitions of Ar III and 112 transitions of Ar IV were classified for the first time. We extended the analysis of Ar III to five new energy levels belonging to 3s23p34d, 3s23p35s odd configurations. For Ar IV, 10 new energy levels of the 3s23p23d and 3s23p24p even and odd configurations, respectively, are presented. For the prediction of energy levels, line transitions, and transition probabilities, relativistic Hartree–Fock calculations were used.

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“…Träbert [7]. The weighted oscillator strengths (gf) and the lifetimes for Ar III were presented using a multiconfiguration Hartree-Fock relativistic (HFR) approach by Luna et al [28]. Nandi et al presented a comprehensive analysis of beam-foil and beamgas excited spectrum of argon observed in small wavelength region, 2965-3090Å, using Ar + and Ar 2+ ions in the energy range 200-650 keV [29].…”

Section: Introductionmentioning

confidence: 99%