Atomic data and spectral line intensities for the beryllium isoelectronic sequence (Ar XV through Kr XXXIII)

doi:10.1016/0092-640X(86)90017-3

Atomic Data and Nuclear Data Tables

Volume 35, Issue 3, November 1986, Pages 449-472

https://doi.org/10.1016/0092-640X(86)90017-3 Get rights and content

Abstract

Oscillator strengths, radiative decay rates, and electron collision strengths are calculated for the ions Ar XV, Ti XIX, Ni XXV, Ge XXIX, and Kr XXXIII in the Be I isoelectronic sequence. The corresponding atomic data for the ions Ca XVII, Cr XXI, Fe XXIII, Zn XXVII, and Se XXXI are determined by interpolation. The configurations included in the calculation of the atomic data are 2s², 2s2p, 2p², 2s3s, 2s3p, 2s3d, 2p3s, 2p3p, and 2p3d. The intensities for transitions between the lowest 20 levels of these configurations are calculated for an electron temperature equal to half the ionization potential and for electron densities equal to 10¹³, 10¹⁴, and 10¹⁵ cm⁻³.

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Electron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for Ar XV. The configurations used are $2 s^{2}$ , $2 s 2 p$ , $2 p^{2}$ , $2 l 3 l^{'}$ , $2 l 4 l^{'} and 2 s 5 l^{'}$ , with $l = s,p and l^{'} = s,p,d$ giving rise to 92 fine-structure levels in intermediate coupling. Collision strengths are calculated at eight incident energies (10, 20, 30, 60, 120, 180, 240, and 300 Ry) for transitions within the three lowest configurations, and five incident energies (60, 120, 180, 240, and 300 Ry) for transitions between the lowest five levels and the n = 3, 4, 5 configurations, using the distorted wave approximation. Excitation rate coefficients are calculated as a function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients and the radiative transition rates of the present work, and R-matrix results for the 2s², 2s2p, 2p² configurations available in the literature, statistical equilibrium equations for level populations are solved at electron densities covering the range of 10⁸–10¹⁴ cm⁻³ at an electron temperature of $\log T_{e} (K) = 6.6$ , corresponding to the maximum abundance of Ar XV. Spectral line intensities are calculated, and their diagnostic relevance is discussed. Observed line ratios indicate electron temperatures of the relevant emitting plasma close to $\log T_{e} (K) = 6.6$ . This dataset will be made available in the next version of the CHIANTI database.
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Atomic Data and Nuclear Data Tables

Abstract

References (13)

J. Opt. Soc. Am.

Mon. Not. R. Astron. Soc.

J. Quant. Spectrosc. Radiat. Transfer

Astron. Astrophys.

Astrophys. J.

Atomic Data and Nuclear Data Tables

Cited by (27)

Characterization of hot dense plasma with plasma parameters

Atomic data and spectral line intensities for Ar XV

Magnetic dipole transition rates in B-like and F-like titanium ions measured at a heavy-ion storage ring

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Cross Sections and Rate Coefficient for Excitation of the 1s<sup>2</sup>2s2p<sup>3</sup>P<sup>o</sup><inf>J</inf>→ 1s<sup>2</sup>2s2p<sup>3</sup>P<sup>o</sup><inf>J′</inf>Fine-structure Transitions in Beryllium-like ions by Heavy Particle Iimpact

Atomic data and spectral line intensities for the nitrogen isoelectronic sequence (Ar XII through Kr XXX)