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Accurate and experimentally validated transition data for Si I and Si II
Malmö University, Faculty of Technology and Society (TS), Department of Materials Science and Applied Mathematics (MTM). Lund Univ, Dept Phys, Div Astrophys, SE-221 00 Lund, Sweden..ORCID iD: 0000-0002-1549-1645
Malmö University, Faculty of Technology and Society (TS), Department of Materials Science and Applied Mathematics (MTM).ORCID iD: 0000-0001-9853-2555
Malmö University, Faculty of Technology and Society (TS), Department of Materials Science and Applied Mathematics (MTM).ORCID iD: 0000-0003-0375-6076
Malmö University, Faculty of Technology and Society (TS), Department of Materials Science and Applied Mathematics (MTM).ORCID iD: 0000-0001-6818-9637
2024 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 682, article id A184Article in journal (Refereed) Published
Abstract [en]

Aims. The aim of this study is to provide radiative data for neutral and singly ionised silicon, in particular for the first experimental oscillator strengths for near-infrared Si I lines. In addition, we aim to perform atomic structure calculations both for neutral and singly ionised silicon while including lines from highly excited levels.

Methods. We performed large-scale atomic structure calculations with the relativistic multiconfiguration Dirac-Hartree-Fock method using the GRASP2K package to determine log(𝑔ƒ) values of Si I and Si II lines, taking into account valence-valence and core-valence electron correlation. In addition, we derived oscillator strengths of near-infrared Si I lines by combining the experimental branching fractions with radiative lifetimes from our calculations. The silicon plasma was obtained from a hollow cathode discharge lamp, and the intensity-calibrated high-resolution spectra between 1037 and 2655 nm were recorded by a Fourier transform spectrometer.

Results. We provide an extensive set of accurate experimental and theoretical log(𝑔ƒ) values. For the first time, we derived 17 log(𝑔ƒ) values of Si I lines in the infrared from experimental measurements. We report data for 1500 Si I lines and 500 Si II lines. The experimental uncertainties of our ƒ-values vary between 5% for the strong lines and 25% for the weak lines. The theoretical log(𝑔ƒ) values for Si I lines in the range 161 nm to 6340 nm agree very well with the experimental values of this study and complete the missing transitions involving levels up to 3s23p7s (61 970 cm−1). In addition, we provide accurate calculated log(𝑔ƒ) values of Si II lines from the levels up to 3s27f (122 483 cm−1) in the range 81 nm to 7324 nm.

Place, publisher, year, edition, pages
EDP Sciences, 2024. Vol. 682, article id A184
Keywords [en]
atomic data, methods: laboratory: atomic, methods: numerical, techniques: spectroscopic
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:mau:diva-66915DOI: 10.1051/0004-6361/202245686ISI: 001178184800003Scopus ID: 2-s2.0-85186144682OAI: oai:DiVA.org:mau-66915DiVA, id: diva2:1854486
Available from: 2024-04-25 Created: 2024-04-25 Last updated: 2024-04-25Bibliographically approved

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Pehlivan Rhodin, AsliHartman, HenrikNilsson, HampusJönsson, Per

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