Transition probabilities and lifetimes for atoms and ions from the sixth row of the periodic table and the database DESIRE

Fivet, V.; Quinet, Pascal; Palmeri, P.; Biémont, Émile; Xu, Huailiang

doi:10.1016/j.elspec.2006.11.021

Cited by 13 publications

(14 citation statements)

References 34 publications

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“…Transition probabilities had been obtained by Palmeri et al (2005) for 45 lines of Re II as a part of the general project to build the DESIRE (Fivet et al 2007). They had used a combination of theoretical branching fractions with radiative lifetimes measured by time-resolved laser-induced fluorescence spectroscopy.…”

Section: A P P E N D I X C : T R a N S I T I O N P Ro Ba B I L I T I mentioning

confidence: 99%

HD 65949: Rosetta stone or red herring

Cowley

Hubrig

Palmeri

et al. 2010

Monthly Notices of the Royal Astronomical Society

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HD 65949 is a late B star with exceptionally strong Hg ii λ3984, but it is not a typical HgMn star. The Re ii spectrum is of extraordinary strength. Abundances or upper limits are derived here for 58 elements based on a model with Teff= 13 100 K and log (g) = 4.0. Even‐Z elements through nickel show minor deviations from solar abundances. Anomalies among the odd‐Z elements through copper are mostly small. Beyond the iron peak, a huge scatter is found. Enormous enhancements are found for the elements rhenium through mercury (Z= 75–80). We note the presence of Th iii in the spectrum. The abundance pattern of the heaviest elements resembles the N= 126 r‐process peak of solar material, though not in detail. An odd‐Z anomaly appears at the triplet (Zr Nb Mo), and there is a large abundance jump between Xe (Z= 54) and Ba (Z= 56). These are signatures of chemical fractionation. We find a significant correlation of the abundance excesses with second ionization potentials for elements with Z > 30. If this is not a red herring (false lead), it indicates the relevance of photospheric or near‐photospheric processes. Large excesses (4–6 dex) require diffusion from deeper layers with the elements passing through a number of ionization stages. That would make the correlation with second ionization potential puzzling. We explore a model with mass accretion of exotic material followed by the more commonly accepted differentiation by diffusion. That model leads to a number of predictions which challenge future work. New observations confirm the orbital elements of Gieseking and Karimie, apart from the systemic velocity, which has increased. Likely primary and secondary masses are near 3.3 and 1.6 M⊙, with a separation of ca. 0.25 au. New atomic structure calculations are presented in two appendices. These include partition functions for the first through third spectra of Ru, Re and Os, as well as oscillator strengths in the Re ii spectrum.

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Section: A P P E N D I X C : T R a N S I T I O N P Ro Ba B I L I T I mentioning

confidence: 99%

HD 65949: Rosetta stone or red herring

Cowley

Hubrig

Palmeri

et al. 2010

Monthly Notices of the Royal Astronomical Society

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“…In the past, this method has appeared to be effective in predicting the radiative properties of heavy near-neutral and neutral atoms (see, e.g., Refs. [45][46][47] for review papers), although it could be challenging when considering perturbed Rydberg series of such species (see, e.g., Ref. [33]).…”

Section: Theoretical Determination Of Lifetimesmentioning

confidence: 99%

Radiative-lifetime measurements and calculations of odd-parity highly excited levels in Ba i

et al. 2010

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Natural radiative lifetime measurements have been performed for 70 odd-parity highly excited levels of neutral barium in the energy range from 308 15.512 to 417 59.93 cm −1 by a time-resolved laser-induced fluorescence technique in a laser-produced plasma. The lifetime values measured in this paper are in the range from 11.3 to 901 ns. They are compared with the published lifetimes of four levels. Two of them are in good agreement, whereas for the other two our measurements are slightly longer than the published data. The reasons for the discrepancies are discussed. Comparisons with theoretical results of the Hartree-Fock method with relativistic corrections illustrate the difficulties associated with the use of Cowan's codes for obtaining accurate branching fractions for transitions depopulating highly excited levels along the Rydberg series of heavy neutral elements. This work will be useful to extend the set of oscillator strengths available in Ba I.

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“…To date, DESIRE contains results for the following ions: Ta I, W II, W III, Re I, Re II, Os I, Os II, Ir I, Ir II, Au I, Au II, Tl I, Pb I and Bi II, but is regularly updated. More details can be found in Fivet et al (2007).…”

Section: Context Of the Present Workmentioning

confidence: 99%

Landé g-factors along the sixth row of the periodic table

Biémont

Palmeri

Quinet

2010

J. Phys. B: At. Mol. Opt. Phys.

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Landé g-factors are calculated, in intermediate coupling, for 2084 levels belonging to atoms or ions of the sixth row of the periodic table. Extensive configuration interaction and relativistic effects are included in the framework of the relativistic Hartree-Fock approximation including core-polarization effects. The results have been refined using least-squares fittings of the Hamiltonian eigenvalues to the observed energy levels (when available). The new results fill in some gaps in the existing data for a large number of levels belonging to ions of astrophysical interest and are expected to be useful for investigating magnetic fields in CP stars.

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Transition probabilities and lifetimes for atoms and ions from the sixth row of the periodic table and the database DESIRE

Cited by 13 publications

References 34 publications

HD 65949: Rosetta stone or red herring

HD 65949: Rosetta stone or red herring

Radiative-lifetime measurements and calculations of odd-parity highly excited levels in Ba i

Landé g-factors along the sixth row of the periodic table

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