J/A+A/631/A29 Si III and Si IV MCDHF and RCI calculations (Atalay+, 2019)
MCDHF and RCI calculations of energy levels, lifetimes, and transition rates
in Si III and Si IV.
Atalay B., Brage T., Jonsson P., Hartman H.
<Astron. Astrophys. 631, A29 (2019)>
=2019A&A...631A..29A 2019A&A...631A..29A (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data
Abstract:
We present extensive multiconfiguration Dirac-Hartree-Fock and
relativistic configuration interaction calculations including 106
states in doubly ionized silicon (SiIII) and 45 states in triply
ionized silicon (SiIV), which are important for astrophysical
determination of plasma properties in different objects. These
calculations represents an important extension and improvement of
earlier calculations especially for SiIII. The calculations are in
good agreement with available experiments for excitation energies,
transition properties, and lifetimes. Important deviations from the
NIST-database for a selection of perturbed Rydberg series are
discussed in detail.
Description:
Transition data for all the computed transitions in SiIII (see Table
1) and SiIV (see Table 2). In Cols. 1 and 2 the upper and lower levels
taking part in the transition are displayed. The transition energies
σ and wavelengths λvacuum are given in Cols. 3 and 4,
respectively. The transition rates A and oscillator strengths gf are
given in Cols. 5 and 6. The rescaled transition rates A_resc and
oscillator strengths gf_resc are given in Cols. 7 and 8. Finally, the
uncertainty in the computed rates dT (dT=|Al-Av|)/(max(Al,Av)))
is given in Cols. 9. In both tables, the data are sorted energy-wise,
starting with the transition that corresponds to the highest energy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 106 1136 Transition data for SiIII
table2.dat 106 295 Transition data for SiIV
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Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Upper Upper level
19- 34 A16 --- Lower Lower level
37- 45 F9.2 cm-1 sigma Transition energy, ΔE
47- 57 F11.4 nm lambdavac Wavelength (in vacuum) (1)
58 A1 --- n_lambdavac [*] Note (2)
60- 69 E10.4 s-1 A Transition rate
70- 79 E10.4 --- gf Oscillator strength
80- 90 E11.4 s-1 Aresc The rescaled transition rate
91-101 E11.4 --- gfresc The rescaled oscillator strength
102-106 F5.3 --- dT The uncertainty in the computed rates
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Note (1): Wavelength and wavenumber values are from the NIST database when
available.
NIST Atomic Spectra Database 2018 (Kramida et al., 2018, NIST
Atomic Spectra Database, ver. 5.5.6 (Online), available:
https://physics.nist.gov/asd (2015, April 16), National Institute of
Standards and Technology, Gaithersburg, MD).
Note (2): Wavelengths marked with * are the Ritz wavelengths calculated
from the energy differences and these transitions are not identified in
the NIST database.
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Acknowledgements:
Betul Atalay, betul.atalay(at)teorfys.lu.se
(End) Patricia Vannier [CDS] 24-Sep-2019