Dielectronic recombination-rate coefficients to excited states of Be-like oxygen and dielectronic satellite lines

2002 ◽  
Vol 80 (12) ◽  
pp. 1525-1542 ◽  
Author(s):  
I Murakami ◽  
U I Safronova ◽  
T Kato
Keyword(s):  
Electron Temperature ◽  
Quantum Number ◽  
Excited States ◽  
Recombination Rate ◽  
Transition Probabilities ◽  
Principal Quantum Number ◽  
Dielectronic Recombination ◽  
Spectral Lines ◽  
Rate Coefficients ◽  
Dielectronic Satellite

We calculate energy levels, radiative transition probabilities, and autoionization rates for Be-like oxygen (O4+) including 1s2 2lnl' (n = 2–8, l [Formula: see text] n – 1) and 1s23l' nl (n = 3–6, l [Formula: see text] n – 1) states by the multiconfigurational Hartree–Fock method (Cowan code) and the perturbation theory Z-expansion method (MZ code). The state selective dielectronic recombination-rate coefficients to excited states of Be-like oxygen are obtained, which are useful for modeling O V spectral lines in a recombining plasma. Configuration mixing plays an important role for the principal quantum number, n, distribution of the dielectronic recombination-rate coefficients for 2snl (n [Formula: see text] 5) levels at low electron temperature. The orbital angular momentum quantum number, l, distribution of the rate coefficients shows a peak at l = 4. The total dielectronic recombination-rate coefficient is derived as a function of electron temperature. The dielectronic satellite lines are also obtained. PACS Nos.: 34.80Lx, 32.80Dz, 32.30Jc, 31.10+z

Dielectronic recombination and satellite line spectra of highly charged tungsten ions1This article is part of a Special Issue on the 10th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas.

2011 ◽  
Vol 89 (5) ◽  
pp. 581-589 ◽  
Author(s):  
U.I. Safronova ◽  
A.S. Safronova ◽  
P. Beiersdorfer
Keyword(s):  
Perturbation Theory ◽  
Excited States ◽  
Transition Probabilities ◽  
Dielectronic Recombination ◽  
Rate Coefficients ◽  
Atomic Data ◽  
Correct Identification ◽  
Many Body ◽  
International Colloquium ◽  
Many Body Perturbation Theory

We present our recent progress on theoretical studies that involve auto-ionizing states of highly charged tungsten ions. Such auto-ionizing states have two channels for decay, which requires that both radiative and auto-ionization atomic data be calculated and combined in a detailed study of the dielectronic recombination (DR). Three atomic codes are used to produce relativistic atomic data (energy levels, radiative transition probabilities, and auto-ionization rates). These are the relativistic many-body perturbation theory (RMBPT) code, the multiconfiguration relativistic Hebrew University Lawrence Livermore atomic code (HULLAC), and the Hartree–Fock relativistic (Cowan) code. Branching ratios relative to the first threshold and intensity factors are calculated for satellite lines, and DR rate coefficients are determined for the excited states. The total DR rate coefficient is derived as a function of electron temperature, and it is shown that the contribution of the highly excited states is very important for the calculation of the total DR rates. Synthetic dielectronic satellite spectra are constructed, and the atomic properties specific to the relevant tungsten ions are highlighted. First, we will consider the results for Na-like tungsten (W63+) and Mg-like tungsten (W62+) using all three codes. Then, we move to even higher ionization states and present the results in Li-like W (W71+). For this we use the RMBPT code as well as the quasi-relativistic many-body perturbation theory (MZ) code. The inclusion of the DR process is essential for correct identification of the lines in impurity spectra and for understanding the main contributions to the total radiation losses.

Dielectronic recombination rate coefficients for excited states of He fromHe+

1999 ◽  
Vol 60 (5) ◽  
pp. 3750-3755 ◽  
Author(s):  
Jian-Guo Wang ◽  
Takako Kato ◽  
Izumi Murakami
Keyword(s):  
Excited States ◽  
Recombination Rate ◽  
Dielectronic Recombination ◽  
Rate Coefficients

Dielectronic recombination rate coefficients for the CoI isoelectronic sequence

2009 ◽  
Vol 42 (10) ◽  
pp. 105203 ◽  
Author(s):  
Fan-Chang Meng ◽  
Li Zhou ◽  
Min Huang ◽  
Chong-Yang Chen ◽  
Yan-Sen Wang ◽  
...  
Keyword(s):  
Recombination Rate ◽  
Dielectronic Recombination ◽  
Rate Coefficients ◽  
Isoelectronic Sequence
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