Hyperfine structure investigation of Sc I, part II: theoretical studies of the odd configurations

Öztürk, I. K.; Acar, F. Gülay; Başar, Günay; Kröger, S.

doi:10.1088/0031-8949/75/5/006

Cited by 6 publications

(10 citation statements)

References 12 publications

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“…In the previous papers [10,11], the results on the fine structure calculation of atomic Scandium were presented for one even parity configuration 3d 2 4s and for three odd parity configurations 3d4s4p, 4s 2 4p, 3d 2 4p. In this work, we have calculated the fine structure of even parity configuration 3d4s 2 of atomic Scandium for the first time.…”

Section: Fine Structurementioning

confidence: 99%

“…The three configurations 3d4s4p, 4s 2 4p and 3d 2 4p were comprised of 23, two and 45 theoretical fine structure levels, respectively. Using the 62 experimental energy levels below 40000 cm -1 in a least squares fit with 20 free parameters, an average deviation of 95 cm -1 was achieved [11]. For the 3d 2 4s configuration, the program code of Cowan [13] was also applied in SL-coupling scheme by fitting the 16 experimental energy levels with an average deviation of 12 cm -1 [10].…”

Section: Fine Structurementioning

confidence: 99%

“…(9) into Eq. (10), and making the notational simplification δ − = * n n (11) R ij can be obtained in an explicit form,…”

Section: The Quantum Defect Orbitals (Qdo) Theorymentioning

confidence: 99%

“…The parametric analysis of the fine structure of even parity configuration 3d 2 4s and three odd parity configurations 3d4s4p, 4s 2 4p, 3d 2 4p used for this work, has already been done [10,11]. The transition probabilities of the Sc I have calculated by using the quantum defect orbital (QDO) theory and Cowan code.…”

Section: Introductionmentioning

confidence: 99%

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Transition probabilities of neutral scandium

et al. 2014

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The electric dipole transition probabilities and the oscillator strengths of neutral scandium have been calculated using the quantum defect orbital theory and the Cowan code for the 3d4s2–3d4s4p, 3d24s–3d24p, and 3d4s2–4s24p transitions. In addition, a parametric analysis of the fine structure for the 3d4s2 configuration of even parity is performed using Cowan code. The transition probabilities and the oscillator strengths obtained in this work are mostly in agreement with the data obtained from different theoretical works given in the literature. Moreover, transition probabilities for 24 levels of neutral scandium are given for the first time.

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Section: Fine Structurementioning

confidence: 99%

Section: Fine Structurementioning

confidence: 99%

“…(9) into Eq. (10), and making the notational simplification δ − = * n n (11) R ij can be obtained in an explicit form,…”

Section: The Quantum Defect Orbitals (Qdo) Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transition probabilities of neutral scandium

et al. 2014

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“…Relativistic Hartree-Fock calculation for the HFS constants of the 2 D 3/2,5/2 states was performed by Desclaux & Bessis [20]. The parametric analyses for the HFS of the configurations 3d 2 4s, 3d4s4p, 3d 2 4p, and 4s 2 4p were performed by Siefart [18], Başar et al [12], and Öztürk et al [21], and the predicted HFS A values for all levels of these configurations were presented. Using the multi-configuration Dirac-Fock model, Bieroń et al [22] evaluated the HFS A constants of some 3d4s4p and 3d 2 4s levels, most of which agree well with the measured FTS results by Aboussaïd et al [14] & Dembczyński et al [1] reported semi-empirical predicted values of the HFS A constants of many even configurations.…”

Section: Introductionmentioning

confidence: 99%

Hyperfine structure constants of Sc I determined from fourier transform spectra

Kaleem,

Uddin,

et al. 2023

Phys. Scr.

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Fourier Transform Spectra of Scandium were analyzed, and hyperfine structure constants of odd and even levels of the configurations 3d2(4p+5p+4s+5s+4d), 3d4s(4p+5p+5s+6s+4d+5d), 3d3, 3d4p2,and 4s2(4p+4d) are determined. The hyperfine structures extracted from FT spectra were simulated and fitted to find the hf structure constants. A total of 104 even levels and 95 odd levels hf constants of Sc I are determined. The values of hf constants were compared with the published data, and a good agreement was found between them. The hf constants of 10 odd and 11 even levels are new. Seven hf constants values have been modified. Two software Fitter programs and classification of spectral lines were used to fit and simulate the spectral line’s hyperfine structure in Scandium’s FT spectra.

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Atomic data for the Gaia-ESO Survey

Heiter

Lind

Bergemann

et al. 2021

A&A

127

142

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Context. We describe the atomic and molecular data that were used for the abundance analyses of FGK-type stars carried out within the Gaia-ESO Public Spectroscopic Survey in the years 2012 to 2019. The Gaia-ESO Survey is one among several current and future stellar spectroscopic surveys producing abundances for Milky-Way stars on an industrial scale. Aims. We present an unprecedented effort to create a homogeneous common line list, which was used by several abundance analysis groups using different radiative transfer codes to calculate synthetic spectra and equivalent widths. The atomic data are accompanied by quality indicators and detailed references to the sources. The atomic and molecular data are made publicly available in electronic form. Methods. In general, experimental transition probabilities were preferred but theoretical values were also used. Astrophysical g fvalues were avoided due to the model-dependence of such a procedure. For elements whose lines are significantly affected by a hyperfine structure or isotopic splitting, a concerted effort has been made to collate the necessary data for the individual line components. Synthetic stellar spectra calculated for the Sun and Arcturus were used to assess the blending properties of the lines. We also performed a detailed investigation of available data for line broadening due to collisions with neutral hydrogen atoms. Results. Among a subset of over 1300 lines of 35 elements in the wavelength ranges from 475 nm to 685 nm and from 850 nm to 895 nm, we identified about 200 lines of 24 species which have accurate g f-values and are free of blends in the spectra of the Sun and Arcturus. For the broadening due to collisions with neutral hydrogen, we recommend data based on Anstee-Barklem-O'Mara theory, where possible. We recommend avoiding lines of neutral species for which these are not available. Theoretical broadening data by R.L. Kurucz should be used for Sc ii, Ti ii, and Y ii lines; additionally, for ionised rare-earth species, the Unsöld approximation with an enhancement factor of 1.5 for the line width can be used. Conclusions. The line list has proven to be a useful tool for abundance determinations based on the spectra obtained within the Gaia-ESO Survey, as well as other spectroscopic projects. Accuracies below 0.2 dex are regularly achieved, where part of the uncertainties are due to differences in the employed analysis methods. Desirable improvements in atomic data were identified for a number of species, most importantly Al i, S i, and Cr ii, but also Na i, Si i, Ca ii, and Ni i.

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Hyperfine structure investigation of Sc I, part II: theoretical studies of the odd configurations

Cited by 6 publications

References 12 publications

Transition probabilities of neutral scandium

Transition probabilities of neutral scandium

Hyperfine structure constants of Sc I determined from fourier transform spectra

Atomic data for the Gaia-ESO Survey

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