J/A+A/592/A141 Helium-like ions with Z=10-36 transition rates (Si+, 2016)
Energy levels and transition rates for helium-like ions with Z=10-36.
Si R., Guo X.L., Wang K., Li S., Yan J., Chen C.Y., Brage T., Zou Y.M.
<Astron. Astrophys. 592, A141 (2016)>
=2016A&A...592A.141S 2016A&A...592A.141S (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes
Abstract:
Helium-like ions provide an important X-ray spectral diagnostics in
astrophysical and high-temperature fusion plasmas. An interpretation
of the observed spectra provides information on temperature, density,
and chemical compositions of the plasma. Such an analysis requires
information for a wide range of atomic parameters, including energy
levels and transition rates. Our aim is to provide a set of accurate
energy levels and transition rates for helium-like ions with Z=10-36.
The second-order many-body perturbation theory (MBPT) was adopted in
this paper. To support our MBPT results, we performed an independent
calculation using the multiconfiguration Dirac-Hartree-Fock (MCDHF)
method.
Description:
We provide accurate energies for the lowest singly excited 70 levels
among 1snl(n≤6,l≤(n-1)) configurations and the lowest doubly excited
250 levels arising from the K-vacancy 2ln'l(n'≤6,l≤(n'-1))
configurations of helium-like ions with Z=10-36. Wavelengths,
transition rates, oscillator strengths, and line strengths are
calculated for the E1, M1, E2, and M2 transitions among these levels.
The radiative lifetimes are reported for all the calculated levels.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 126 8667 Level designations, excitation energies, and
lifetimes for the 321 levels arising from the
1snl(n≤6,l≤(n-1)) and 2ln'l(n'≤6,l≤(n'-1))
configurations of helium-like ions with Z=10-36
table1.pdf 512 1075 PDF version of table 1
table2.dat 97 54861 *Wavelengths, transition rates, oscillator
strengths and line strengths for transitions
among 1snl(n≤6, l≤(n-1)) and
2ln'l(n'≤6, l≤(n'-1)) configurations in
helium-like ions with Z=10-36
table2.pdf 512 4826 PDF version of table 2
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Note on table2.dat: Only transitions which contribute to the total radiative
lifetime by more than 0.1% are presented.
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See also:
J/A+A/376/1113 : Line ratios for helium-like ions (Porquet+, 2001)
J/A+A/583/A82 : Electron-impact excitation for Hydrogen-like ions (Li+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Z [10/36] Z key
4- 6 I3 --- J [1/321] J level
8- 28 A21 --- jj jj-coupling
30- 42 A13 --- LS LS-coupling
44- 52 I9 cm-1 ENIST ?=- NIST excitation energy
54- 62 I9 cm-1 EMBPT ?=- MBPT excitation energy (G1)
64- 72 I9 cm-1 EMCDHF ?=- MCDHF excitation energy (G2)
74- 82 E9.4 s tauMBPT ?=- MBPT lifetime (G1) (3)
84- 92 E9.4 s tauMCDHF ?=- MCDHF lifetime (G2) (3)
94- 98 F5.1 % Comp1 LS-coupling composition of the level
100 A1 --- --- '('
101-103 I3 --- n_Comp1 [1/321]? Level for Comp1
104 A1 --- --- ')'
106-110 F5.2 % Comp2 ? LS-coupling composition of the level
111 A1 --- --- '('
112-114 I3 --- n_Comp2 [1/321]? Level for Comp2
115 A1 --- --- ')'
117-121 F5.2 % Comp3 ? LS-coupling composition of the level
122 A1 --- --- '('
123-125 I3 --- n_Comp3 [1/321]? Level for Comp3
126 A1 --- --- ')'
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Note (3): These lifetimes only include contributions from single-photon
transitions.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Z [10/36] Z key
4- 6 I3 --- j [2/321] Upper index
8- 10 I3 --- i [1/320] Lower index
12- 22 E11.6 0.1nm lMBPT MBPT wavelength
24- 34 E11.6 0.1nm lMCDHF ?=- MCDHF wavelength
36- 37 A2 --- Type Type (E1, E2, M1 or M2)
39- 47 E9.4 s-1 AMBPT MBPT transition rate (G1)
49- 57 E9.4 --- fMBPT MBPT oscillator strength (G1)
59- 67 E9.4 --- SMBPT MBPT line strength (in a.u.) (G1)
69- 77 E9.4 --- AMCDHF ? MCDHF transition rate (G2)
79- 87 E9.4 --- fMCDHF ? MCDHF oscillator strength (G2)
89- 97 E9.4 --- SMCDHF ? MCDHF line strength (in a.u.) (G2)
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Global notes:
Note (G1): MBPT: second-order many-body perturbation theory.
Note (G2): MCDHF: multiconfiguration Dirac-Hartree-Fock method.
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Acknowledgements:
Ran Si, 13110200004(at)fudan.edu.cn
(End) Patricia Vannier [CDS] 25-Aug-2016