2008
DOI: 10.1051/0004-6361:200810531
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Energy levels, radiative rates, and electron impact excitation rates for transitions in O VII

Abstract: Aims. In this paper we report calculations for energy levels, radiative rates, and electron impact excitation rates for transitions in O vii. Methods. The grasp (general-purpose relativistic atomic structure package) is adopted for calculating energy levels and radiative rates. For determining the collision strengths and subsequently the excitation rates, the Dirac atomic R-matrix code (darc) and the flexible atomic code (fac) are used. Results. Oscillator strengths, radiative rates, and line strengths are rep… Show more

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Cited by 22 publications
(45 citation statements)
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“…Furthermore, our MBPT energy levels and those from Savukov et al (2003) agree to by about 140 ppm, 200 ppm, and 270 ppm for Ne IX, Si XIII, and Ar XVII, respectively. Almost all the level energies calculated by Aggarwal et al (2005Aggarwal et al ( , 2008Aggarwal et al ( , 2009Aggarwal et al ( , 2010Aggarwal et al ( , 2011Aggarwal et al ( , 2012cAggarwal et al ( ,a,d,b, 2013b are lower than our MBPT values by more than 20 000 cm −1 , which corresponds to about 0.2% in the low-Z end and 300 ppm in the high-Z end. This is due to the inadequate inclusion of the electron correlation in their calculations, as pointed out above.…”
Section: Energy Levelscontrasting
confidence: 68%
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“…Furthermore, our MBPT energy levels and those from Savukov et al (2003) agree to by about 140 ppm, 200 ppm, and 270 ppm for Ne IX, Si XIII, and Ar XVII, respectively. Almost all the level energies calculated by Aggarwal et al (2005Aggarwal et al ( , 2008Aggarwal et al ( , 2009Aggarwal et al ( , 2010Aggarwal et al ( , 2011Aggarwal et al ( , 2012cAggarwal et al ( ,a,d,b, 2013b are lower than our MBPT values by more than 20 000 cm −1 , which corresponds to about 0.2% in the low-Z end and 300 ppm in the high-Z end. This is due to the inadequate inclusion of the electron correlation in their calculations, as pointed out above.…”
Section: Energy Levelscontrasting
confidence: 68%
“…The differences between our MBPT lifetimes and those from Savukov et al (2003) are generally smaller than 1% as well. However, and as expected, our MBPT results differ substantially from those of Aggarwal et al (2005Aggarwal et al ( , 2008Aggarwal et al ( , 2009Aggarwal et al ( , 2010Aggarwal et al ( , 2011Aggarwal et al ( , 2012cAggarwal et al ( ,a,d,b, 2013b. The largest difference is up to 70% in Na X and still as large as 15% in Kr XXXV.…”
Section: Radiative Lifetimessupporting
confidence: 55%
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“…We would like to nonetheless evaluate the radiative datasets for both allowed and forbidden transitions involving levels with principal quantum number n ≤ 5 in this sequence computed by different methods: (i) IC energies and E1 A-values for (Z, N ) = (2, 2) calculated with the B-spline R-matrix method in combination with the MCHF structure code [118]; (ii) LS term energies and E1 A-values for (2, 2) and (6−8, 2) listed in the NORAD database obtained with the R-matrix method in a 10-state target approximation in the context of electron-ion recombination and photoionization studies [90,95,119,120]; (iii) A-values for E1, E2, M1 and M2 transitions in (6−8, 2) and (10, 2) computed with a relativistic CI method [121]; (iv) relativistic energies and A-values for allowed and forbidden transitions computed with atomic structure codes to implement targets for electron-ion scattering, namely (3−11, 2) with GRASP [122][123][124][125] and (7−8, 2) and (10, 2) with SUPERSTRUCTURE [126][127][128].…”
Section: He Sequencementioning
confidence: 99%
“…Most of the radiative datasets that have been computed with GRASP [122][123][124][125] and SUPERSTRUCTURE [127] (A-values from [126,128] were not available) for He-like ions have used CI expansions streamlined for collisional targets rather than to obtain accurate A-values. Therefore, such CI is not fully converged, and the accuracy for both allowed and forbidden transitions in low-Z ions and involving excited states can be poor.…”
Section: Conclusion and Recommendationsmentioning
confidence: 99%