Recent Advances in the Study of Lanthanide Atoms and Ions

Biémont, Émile; Quinet, Pascal

doi:10.1238/physica.topical.105a00038

Cited by 85 publications

(34 citation statements)

References 35 publications

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“…This collapse has been described previously (e.g., [24]). It is clearly visible in La along the Cs isoelectronic sequence (see Fig.…”

Section: Results Obtained Through the Relativistic Hartreefock Approxsupporting

confidence: 78%

“…It is clearly visible in La along the Cs isoelectronic sequence (see Fig. 3 of [24]) and appears stronger and stronger in the lanthanide group when the number of electrons is increasing in the 4f shell (see Fig. 4 of [24]).…”

Section: Results Obtained Through the Relativistic Hartreefock Approxmentioning

confidence: 99%

“…Abundance measurements of rare earth elements are also needed for constraining calculations of nucleosynthesis (for references and most recent work, see [22][23][24][25][26]). The stellar spectra are generally dominated by neutral atoms and by ions in low charge states.…”

Section: Introductionmentioning

confidence: 99%

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Atomic structure calculations and beam-foil observations of La IV

et al. 2009

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Relativistic Hartree-Fock and multiconfigurational Dirac-Fock calculations of atomic structure and transition rates have been carried out in trebly ionized lanthanum (La 3+ , Z = 57). The calculations have to cope with configuration interaction effects but also with the very complex situation of the collapse of the 4f wave function. The calculations are compared to experimental data obtained with beam-foil spectroscopy in the extreme ultraviolet, at ion energies that favour the production of the spectrum La IV. Besides lines known from sliding spark discharges, many more lines are observed that have not yet been identified. Time-resolved measurements yield three level lifetimes in La IV that agree roughly with the results of our own calculations.PACS Nos: 32.30.Jc, 32.70.Cs, 34.50.Fa, 31.15.ag, 31.15.xr Résumé : Des calculs Hartree-Fock relativistes de structures atomiques et de taux de transition et des calculs à l'aide de l'approche multiconfigurationnelle de Dirac-Fock ont été effectués dans le lanthane trois fois ionisé (La 3+ , Z = 57). Ces calculs doivent prendre en compte l'interaction de configuration mais aussi la situation très complexe associée à la contraction de l'orbitale 4f. Les calculs ont été comparés aux données expérimentales obtenues à l'aide de la spectroscopie faisceau-lame dans l'ultraviolet lointain à des énergies qui favorisent l'émission du spectre de La IV. Outre les raies spectrales connues à partir des spectres d'étincelles glissantes, beaucoup de raies supplémentaires ont été observées qui n'ont pas encore été identifiées. Les mesures résolues dans le temps ont permis d'obtenir trois durées de vie dans La IV qui sont en accord satisfaisant avec les résultats de nos calculs.[Traduit par la Rédaction]

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“…This collapse has been described previously (e.g., [24]). It is clearly visible in La along the Cs isoelectronic sequence (see Fig.…”

Section: Results Obtained Through the Relativistic Hartreefock Approxsupporting

confidence: 78%

Section: Results Obtained Through the Relativistic Hartreefock Approxmentioning

confidence: 99%

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Atomic structure calculations and beam-foil observations of La IV

et al. 2009

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“…In view of the large number of uncertainties affecting the positions, the spectroscopic designations and/or the J-quantum numbers in the configurations with nZ7, we focused our study on the lowest states belonging to 6p 4 the Po VII ionic core were estimated using a pseudopotential and a correction to the dipole operator according to the HFR þCPOL procedure described in many of our previous papers (see e.g. [25][26][27]). These CPOL corrections depend on two paremeters, i.e.…”

Section: Atomic Structure Calculationsmentioning

confidence: 99%

Investigation of intravalence, core–valence and core–core electron correlation effects in polonium atomic structure calculations

Quinet

2014

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tA detailed investigation of the atomic structure and radiative parameters involving the lowest states within the 6p 4 , 6p 3 6d, 6p 3 7s, 6p 3 7p and 6p 3 7d configurations of neutral polonium is reported in the present paper. Using different physical models based on the pseudo-relativistic Hartree-Fock approach, the influence of intravalence, core-valence and core-core electron correlation on the atomic parameters is discussed in detail. This work allowed us to fix the spectroscopic designation of some experimental level energy values and to provide for the first time a set of reliable oscillator strengths corresponding to 31 Po I spectral lines in the wavelength region from 175 to 987 nm.

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“…Owing to the importance of rare-earth elements in astrophysics, especially in relation to nucleosynthesis and star formation (notably the lanthanides in chemically peculiar (CP) stars [1]), there is a growing need for accurate spectroscopic data, i.e., wavelengths, radiative transition rates, oscillator strengths, branching fractions, radiative lifetimes, hyperfine structure and isotope shift data for lanthanide atoms and ions. Doubly ionized lanthanum (La III) is characterized by a simple atomic structure with core [Xe] and only one outer electron.…”

Section: Introductionmentioning

confidence: 99%