Hyperfine Structure and Isotope Shift of Osmium I

Kröger, S.; Başar, Günay; Baier, A.; Guthöhrlein, G.

doi:10.1238/physica.regular.065a00056

Cited by 13 publications

(28 citation statements)

References 28 publications

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“…These values can be used to determine the line and level shifts for any pair of neutral osmium isotopes. Comparisons with the experimental fine-structure level shifts by Kröger et al [121] for the isotope pair 190,192 Os I revealed good agreement with our theoretical predictions. …”

Section: Sixth Row Elementssupporting

confidence: 88%

Overview of recent advances performed in the study of atomic structures and radiative processes for the lowest ionization stages of heavy elements

Quinet

2017

Can. J. Phys.

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During the past 20 years, part of our work has been focused on the study of the atomic structure and the determination of radiative parameters in neutral and slightly ionized heavy atoms (Z ≥ 37). These elements attracted little previous interest because of the complexity of their electronic structures, the poor knowledge of their spectra, and the difficulty to perform experimental measurements. They present, however, great interest in the development of other scientific areas, such as astrophysics and plasma physics. In this paper, we give an overview of the recent progress performed by the group of Atomic Physics and Astrophysics at Mons University (Belgium) in the theoretical modelling and the experimental analysis of such heavy elements. We also discuss some applications of the atomic data obtained in our work for the interpretation of the spectra observed from astrophysical and laboratory plasmas.Key words: atomic data, oscillator strengths, radiative transition probabilities, heavy elements.Résumé : Durant les 20 dernières années, une partie de notre travail a été focalisée sur l'étude de la structure atomique et la détermination des paramètres radiatifs dans les atomes lourds neutres et faiblement ionisés (Z ≥ 37). Ces éléments avaient attiré peu d'intérêt auparavant à cause de la complexité de leurs structures électroniques, du manque de connaissance de leurs spectres et de la difficulté à réaliser des mesures expérimentales. Ils présentent cependant un grand intérêt pour le développe-ment d'autres domaines scientifiques comme l'astrophysique et la physique des plasmas. Dans cet article, nous présentons un aperçu général des progrès récents réalisés par le groupe de Physique Atomique et Astrophysique de l'Université de Mons (Belgique) dans la modélisation et l'analyse expérimentale de tels éléments lourds. Nous discutons également quelques applications des données atomiques obtenues dans notre travail pour l'interprétation des spectres observés à partir de plasmas astrophysiques et de laboratoire.Mots-clés : ions lourds, données atomiques, temps de vie radiatifs, forces d'oscillateur, probabilités de transition.

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Section: Sixth Row Elementssupporting

confidence: 88%

Overview of recent advances performed in the study of atomic structures and radiative processes for the lowest ionization stages of heavy elements

Quinet

2017

Can. J. Phys.

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“…Further measurements, using radiogenic Os-enriched samples, were performed by Guthörhlein et al (1961Guthörhlein et al ( , 1969 and by Himmel (1968). The hyperfine structure and isotope shifts of many levels and lines in Os I were investigated by Kröger et al (2002) using LIF spectroscopy.…”

Section: Atomic Structure and Spectra Of Os I And Os Iimentioning

confidence: 99%

“…The partition functions are taken from Irwin (1981). The isotopic structure as well as the hyperfine structure of 189 Os have been taken into account, using data from Blaise & Wyart (1989) and Kröger et al (2002). Among all the lines examined, only three (at 326.7945, 330.1559 and 442.0468 nm) were retained for the final analysis.…”

Section: A New Solar Abundance For Osmiummentioning

confidence: 99%

Transition probabilities and lifetimes in neutral and singly ionized osmium and the Solar osmium abundance

Quinet¹,

Palmeri²,

Biémont³

et al. 2006

A&A

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Radiative lifetime measurements have been performed, with a time-resolved laser-induced fluorescence technique, for 12 levels of Os I and for 9 levels of Os II. For 9 levels of Os I and 4 levels of Os II, there were no previous experimental data available. From a comparison with new theoretical calculations, taking configuration interactions and core-polarization effects into account, it has been possible to deduce oscillator strengths for 129 transitions of Os I and 137 transitions of Os II of astrophysical interest appearing in the wavelength range 180.0-870.0 nm. These results have allowed us to revise the abundance of osmium in the solar photosphere (log ε Os = 1.25 ± 0.11). The newly derived oscillator strengths have been applied as well to derive the osmium abundance in the carbon-rich metal-poor star HD 187861.

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“…For example laser induced fluorescence spectroscopy has been applied to measure IS and hfs of Os I spectral lines in the visible range [5]. We have also to mention that other sophisticated measurements of the isotope shifts of the stable 184,[186][187][188][189][190]192 Os isotopes have been made using the crossedbeams technique in Manchester [6]: atomic beams of Os were produced by laser ablation of pills of compressed natural Os powder whose diameter and thickness were 5 mm and 3 mm.…”

Section: Introductionmentioning

confidence: 99%

“…They used the non-relativistic Hartree-Fock method. In opposite we propose in the present work to use the relativistic Dirac-Hartree-Fock method to analyse experimental data of Os I isotope shift found in the literature without any theoretical background [5].…”

Section: Introductionmentioning

confidence: 99%

MCDHF calculations of isotope shifts of even-parity fine-structure levels in neutral osmium

Palmeri

Quinet

Bouazza

2016

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tAb initio multiconfiguration Dirac-Hartree-Fock (MCDHF) calculations have been carried out in order to determine the isotope shifts of all the fine-structure levels belonging to the even-parity configurations (5d þ 6s) 8 in neutral osmium, Os I. The theoretical predictions have been compared to laser spectroscopy measurements available in the literature showing a good agreement between theory and experiment.

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Hyperfine Structure and Isotope Shift of Osmium I

Cited by 13 publications

References 28 publications

Overview of recent advances performed in the study of atomic structures and radiative processes for the lowest ionization stages of heavy elements

Overview of recent advances performed in the study of atomic structures and radiative processes for the lowest ionization stages of heavy elements

Transition probabilities and lifetimes in neutral and singly ionized osmium and the Solar osmium abundance

MCDHF calculations of isotope shifts of even-parity fine-structure levels in neutral osmium

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