J/ApJS/239/3 Spectroscopic accuracy for B-like ions with Z=24-30 (Si+, 2018)
Energy levels, transition rates and electron impact excitation rates for the
B-like isoelectronic sequence with Z=24-30.
Si R., Zhang C.Y., Cheng Z.Y., Wang K., Jonsson P., Yao K., Gu M.F.,
Chen C.Y.
<Astrophys. J. Suppl. Ser., 239, 3 (2018)>
=2018ApJS..239....3S 2018ApJS..239....3S
ADC_Keywords: Atomic physics
Keywords: atomic data ; atomic processes
Abstract:
We report calculations of spectroscopic accuracy for 513 states in the
B-like ions with Z=24-30. The energy levels and transition rates are
calculated using the second-order many-body perturbation theory, while
multiconfiguration Dirac-Hartree-Fock calculations are performed to
support the former results. The present two sets of results agree
excellently with each other, and can be used as benchmarks in the
future. The electron-impact excitation (EIE) collision strengths are
calculated based on independent processes and isolated resonances
approximation using the distorted wave method. Based on the present
atomic data, the spectral lines of these ions are simulated using a
collisional radiative model. The amount of energy, transition data,
and EIE collision strengths of high accuracy are significantly
increased for several B-like ions of astrophysical interest, where
experimental data are still very scarce. The results can be used in
line identification, plasma modeling, and diagnostics of astrophysical
plasmas.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 122 3591 *Energy levels relative to the ground state and
lifetimes from the present MBPT & MCDHF calculations
table3.dat 99 44880 Transition data for the B-like isoelectronic
sequence with Z=24-30
table5.dat 131 1049745 Effective collision strengths, electron impact
excitations
table6.dat 69 7755 Intensities (normalised) for strong lines at
multiple electron densities
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Note on table1.dat: All 513 energy levels, as well as multipole transition
rates (electric dipole and quadrupole, magnetic dipole and quadrupole), are
calculated using the many-body perturbation theory (MBPT) approach using the
FAC package (Gu+ 2006ApJ...641.1227G 2006ApJ...641.1227G ; Gu 2008CaJPh..86..675G 2008CaJPh..86..675G).
In order to assess the accuracy of the MBPT results, we have also performed
multiconfiguration Dirac-Hartree-Fock (MCDHF) calculations using the GRASP2K
package (Jonsson+ 2013CoPhC.184.2197J 2013CoPhC.184.2197J) for the lowest 300 bound levels
arising from the 1s22l3, 1s22l23l, 1s22l24l, and 1s22s25l
configurations.
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See also:
J/ApJS/156/105 : Transitions in L-shell ions of Fe and Ni (Gu+, 2005)
J/A+A/455/1157 : Boron-like Fe XXII transition probabilities (Jonauskas+, 2006)
J/A+A/547/A87 : B-like iso-electronic sequence (Liang+, 2012)
J/A+A/559/A100 : Boron isoelectronic sequence data (Jonsson+, 2013)
J/ApJS/215/26 : Energy levels & transition rates of C-like ions (Wang+, 2014)
J/A+A/583/A82 : Electron-impact excitation for Hydrogen-like ions (Li+, 2015)
J/ApJS/218/16 : Energy levels & transition rates of Be-like ions (Wang+, 2015)
J/A+A/592/A141 : Helium-like ions with Z=10-36 transition rates (Si+, 2016)
J/ApJS/227/16 : Energy levels & transition rates for F-like ions (Si+, 2016)
J/ApJS/226/14 : MBPT calc. for Ne-like ions (CrXV-KrXXVII) (Wang+, 2016)
J/ApJS/223/3 : Energies & radiative transition ArXII-ZnXXIV (Wang+, 2016)
J/A+A/600/A85 : He-like ions (Z=20-42) collision strengths (Si+, 2017)
J/ApJS/229/37 : Energy levels & transition rates of O-like ions (Wang+, 2017)
J/ApJS/234/40 : Be-like ions from BII to NeVII transition data (Wang+, 2018)
J/ApJS/235/27 : Energy levels & transition rates for P-like ions (Wang+, 2018)
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 [24/30] Atomic number
4- 6 I3 --- Key [1/513] Level, Key number
8- 21 A14 --- Config Configuration
23- 38 A16 --- Term LSJ Term
40- 47 I8 cm-1 E-MBPT [0/18956338] Energy levels,
MBPT calculation
49- 56 I8 cm-1 E-MCDHF [0/18956838] Energy levels,
MCDHF calculation
58- 66 E9.3 s tauMBPT [0/0.0002]? Lifetimes, MBPT calculation
68- 76 E9.3 s tauMCDHF [0/0.0002]? Lifetimes, MCDHF calculation
79-122 A44 --- LSJ LSJ coupling expansion coefficients
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Z [24/30] Atomic number (1)
4- 6 I3 --- j [2/513] Upper level (2)
8- 10 I3 --- i [1/396] Lower level (2)
12- 13 A2 --- Type Transition type
16- 26 E11.5 0.1nm Wave-MBPT [5/1205] Wavelengths, MBPT calculation
29- 39 E11.5 0.1nm Wave-MCDHF [5.8/1206]? Wavelengths, MCDHF calculation
41- 49 E9.3 s-1 A-MBPT [5115/5.2e+13] Transition rates,
MBPT calculation
51- 59 E9.3 --- S-MBPT [1.4e-07/5] Line strengths (in au),
MBPT calculation
61- 69 E9.3 --- gf-MBPT [1e-07/14.5] Oscillator strengths,
MBPT calculation
71- 79 E9.3 s-1 A-MCDHF [5115/5.2e+13]? Transition rates,
MCDHF calculation
81- 89 E9.3 --- S-MCDHF [8e-10/3.6]? Line strengths (in au),
MCDHF calculation
91- 99 E9.3 --- gf-MCDHF [2e-8/10.7]? Oscillator strengths,
MCDHF calculation
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Note (1): Only transitions with a branching ratio of over 0.1% are presented.
Note (2): The indices used to represent the lower (i) and upper (j) levels of
a transition refer to the ordering in Table 1.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Z [24/30] Atomic number
5- 7 I3 --- i [1/512] Lower level
9- 11 I3 --- j [2/513] Upper level
13- 21 E9.3 --- ECS500 [2e-11/70] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*102K
23- 31 E9.3 --- ECS1k [2e-11/81] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*103K
33- 41 E9.3 --- ECS2k [1.8e-11/91] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*2*103K
43- 51 E9.3 --- ECS5k [1e-11/105] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*5*103K
53- 61 E9.3 --- ECS10k [1e-11/115] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*104K
63- 71 E9.3 --- ECS20k [1e-11/125] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*2*104K
73- 81 E9.3 --- ECS50k [8e-12/138] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*5*104K
83- 91 E9.3 --- ECS100k [7.9e-12/152] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*105K
93-101 E9.3 --- ECS200k [7e-12/165] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*2*105K
103-111 E9.3 --- ECS500k [7e-12/188] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*5*105K
113-121 E9.3 --- ECS1000k [6e-12/213] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*106K
123-131 E9.3 --- ECS2000k [5e-12/259] Effective collision strengths,
transition i-j at electron temperature
of (Z-4)2*2*106K
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Z [24/30] Atomic number (1)
5- 7 I3 --- i [1/252] Lower level
10- 12 I3 --- j [2/511] Upper level
15- 25 E11.5 0.1nm Wave [5.5/1205] Wavelengths from
our MBPT calculations
28- 36 E9.3 --- I(10+6) [3e-08/1] Line intensities at electron
densities of 106cm-3
39- 47 E9.3 --- I(10+10) [3e-08/1] Line intensities at electron
densities of 1010cm-3
50- 58 E9.3 --- I(10+15) [1.8e-07/1] Line intensities at electron
densities of 1015cm-3
61- 69 E9.3 --- I(10+20) [9.7e-09/1] Line intensities at electron
densities of 1020cm-3
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Note (1): Intensities were calculated at log Te[K]=7.00, 7.05, 7,10, 7.15,
7.20, 7.25 and 7.30 for Cr XX, Mn XXI, Fe XXII, Co XXIII, Ni XXIV, Cu
XXV and Zn XXVI, respectively, where the ion fraction peaks in
ionization equilibrium.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 06-Dec-2018