Electron collision excitations in complex spectra of ionized heavy atoms

Bar‐Shalom, A.; Klapisch, M.; Oreg, J.

doi:10.1103/physreva.38.1773

Cited by 283 publications

(117 citation statements)

References 24 publications

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“…The intermediate coupling level energies, including configuration mixing, are calculated using the relativistic version of the parametric potential method (Klapisch 1971). The collisional rate coefficients are calculated in the distorted wave approximation, implementing the highly efficient factorization-interpolation method by Bar-Shalom, Klapisch, & Oreg (1988). Even though the HULLAC accuracy depends on the specific details of each transition, generally, the accuracy of the calculated radiative and collisional rates is believed to be better than 20%.…”

Section: Theoretical Methodsmentioning

confidence: 99%

“…The basic atomic quantities used in this work were generated by means of the multiconfiguration, relativistic HULLAC computer package developed by Bar-Shalom, Klapisch, & Oreg (2001). The intermediate coupling level energies, including configuration mixing, are calculated using the relativistic version of the parametric potential method (Klapisch 1971).…”

Section: Theoretical Methodsmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of High‐lying Levels on Atomic Models Relevant to Spectroscopic Analyses of Solar Extreme‐Ultraviolet Spectra

Doron

Doschek

Feldman

et al. 2002

ApJ

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In this work we investigate the effect of including high-lying configurations in the collisional-radiative models used to calculate spectral line intensities recorded by the Solar Ultraviolet Measurement of Emitted Radiation (SUMER) spectrometer on board the SOHO satellite. Many of the emission lines observed by SUMER are attributed to transitions within the L and M electronic shells of ions isoelectronic to sequences from Li i to Na i. By using atomic data that are mostly generated by the Hebrew University Lawrence Livermore Atomic Code (HULLAC), we incorporate in the atomic models configurations from higher shells and systematically study their effect on the calculated line intensities in selected ions. The high-lying configurations alter the line intensities through radiative cascades and configuration interaction effects. We find that cascades can significantly enhance the line intensities of the considered ions by up to 60% at temperatures of the ion maximum fractional abundance. The enhancement due to cascades increases with increasing temperature and charge state. The configuration mixing effects can either enhance or reduce the line intensities. Generally, the mixing effect becomes less important for higher charge states.

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Section: Theoretical Methodsmentioning

confidence: 99%

Section: Theoretical Methodsmentioning

confidence: 99%

The Effect of High‐lying Levels on Atomic Models Relevant to Spectroscopic Analyses of Solar Extreme‐Ultraviolet Spectra

Doron

Doschek

Feldman

et al. 2002

ApJ

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“…That work tabulates the measured wavelengths of the E1 and M1 transitions, most of them being transitions to the ground level, and the calculated data obtained in a relativistic parametric potential (RPP) method implemented in the HULLAC [32] package. Table 2 contains the experimental and calculated wavelengths of the E1 transitions from [10] and the QR wavelengths calculated in the present work for the ions W 38+ -W 43+ .…”

Section: Transition Wavelengthsmentioning

confidence: 99%

Radiative transitions for three lowest configurations of tungsten ions W38+–W43+

Karpuškienė¹,

Bogdanovich²,

Kisielius³

2017

Lith. J. Phys.

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The ab initio quasirelativistic approximation was used to derive transition data for the multicharged tungsten ions W 38+ -W43+ with an open 4p shell. The configuration interaction method with transformed radial orbitals was applied to include electron correlation effects. The relativistic effects were taken into account in the Breit-Pauli approximation for the quasirelativistic Hartree-Fock radial orbitals. The level energies E, radiative lifetimes τ, and Landé g-factors were calculated for the 4s 4d, and 4s4pN+1 configurations of six tungsten ions. The radiative transition wavelengths λ, spontaneous emission transition probabilities A and their uncertainties for the electric dipole, electric quadrupole, electric octupole, magnetic dipole and magnetic quadrupole transitions among the levels of these configurations are presented.

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“…The details of this type of model have been presented elsewhere [13]. Ab initio atomic structure for the QSS-CR models comes from the HULLAC package [14,15]. For all states formed by the promotion of a n = 2 electron, the rates of autoionization (AI) were computed in the distorted wave approximation by RELAC [lS].…”

Section: Modelsmentioning

confidence: 99%