J/A+A/658/A82 Transition data of E1 transitions for the CeIV (Rynkun+, 2022)
Theoretical studies of energy levels and transition data for Ce IV.
Rynkun P., Banerjee S., Gaigalas G., Tanaka M., Radziute L., Kato D.
<Astron. Astrophys. 658, A82 (2022)>
=2022A&A...658A..82R 2022A&A...658A..82R (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data
Abstract:
We present extensive energy level and transition data for the Ce IV
spectrum. By providing accurate atomic data, we evaluate the impact of
atomic data on the opacity in the neutron star merger ejecta.
We performed energy spectra and transition data calculations using the
GRASP2018 package, which is based on the multiconfiguration
Dirac-Hartree-Fock and relativistic configuration interaction
methods, and the HULLAC code, which is based on a parametric potential
method.
We present energy spectra calculated for the 225 levels for the Ce3+
ion. Energy levels are compared with recommended values from the NIST
Atomic Spectra Database and other available works. The
root-mean-square (rms) deviations obtained for the GRASP2018 energy
levels of the 5p6nl configurations from the NIST data are
1270cm-1. The rms deviations for the HULLAC results from the NIST
data are 5780cm-1. Furthermore, electric dipole (E1) transition
data, line strengths, weighted oscillator strengths, and transition
rates are computed between the above levels. The computed transition
rates are compared with other theoretical computations. We also
evaluate the accuracy of the wave functions and transition parameters
by analyzing the dependencies of the line strength S on the gauge
parameter G. The gauge dependency method also allows us to determine
the transitions for which the ratio between the Babushkin and Coulomb
gauges shows real agreement between forms and the transitions for
which the agreement between both gauges is random. Using the GRASP2018
and HULLAC data, the opacities in the neutron star merger ejecta are
also calculated. We find that the opacity of CeIV is higher than that
presented by previous works, which is because of the higher
completeness of our atomic data. Although the differences in the
energy levels and transition probabilities cause different features in
the opacity spectrum, the Planck mean opacities of both data sets
agree within 20%.
Description:
Table 6 presents electric dipole (E1) transition data between the
states of the calculated energy levels for the CeIV. In the Table
transition data, such as wavelengths, weighted oscillator strengths,
line strengths, transition rates of E1 transitions, along with the dT
parameter, the G(S=0) parameter and the estimated accuracies are
given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 174 5056 Transition data of E1 transitions for the CeIV
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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- 3 I3 --- Nu Number of upper level as in Table A.1.
5- 8 A4 --- Ju J of upper level
10 A1 --- pu Parity of upper level
12- 34 A23 --- ustate Label of upper level
38- 40 I3 --- Nl Number of lower level as in Table A.1.
42- 45 A4 --- Jl J of lower level
47 A1 --- pl Parity of lower level
49- 71 A23 --- lstate Label of lower level
76- 81 I6 cm-1 deltaE Transition energy
85- 95 F11.2 0.1nm lambda Wavelength of transition (Angstroem)
100-108 E9.3 s-1 A Radiative transition probability in the
Babushkin gauge
113-121 E9.3 --- gf Weighted oscillator strength in the
Babushkin gauge
126-134 E9.3 --- SB Line strength in the Babushkin gauge
139-147 E9.3 --- SC Line strength in the Coulomb gauge
152-156 F5.3 --- dT Parameter defined in (Ekman et al.,
2014A&A...564A..24E 2014A&A...564A..24E), which shows the
relative difference between the Babushkin and
Coulomb gauges of the computed transition
rates
160-169 E10.3 --- G(S=0) The minimum of the parabola, which shows
the accuracy of the wave functions
173-174 A2 --- Acc Accuracy classes match the NIST ASD
(Kramida et al., 2020, NIST Atomic Spectra
Database (ver. 5.8)) terminology (1)
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Note (1): Code as:
AA = ≤1%
A+ = ≤2%
A = ≤3%
B+ = ≤7%
B= = <10%
C+ = ≤18%
C = ≤25%
D+ = ≤40%
D = ≤50%
E = >50%
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Acknowledgements:
Pavel Rynkun, pavel.rynkun(at)gmail.com
(End) Pavel Rynkun [VU], Patricia Vannier [CDS] 16-Nov-2021