References of "Biémont, Emile"
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See detailTransition probabilities in Te II and Te III
Zhang, W; Palmeri, P; Quinet, Pascal ULg et al

in Astronomy and Astrophysics (2013), 551

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See detailExperimental and theoretical radiative properties of odd-parity highly excited levels in Mo II
Jiang, L; Wang, Q; Feng, Y et al

in European Physical Journal D -- Atoms, Molecules, Clusters & Optical Physics (2012), 66

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See detailComparative semi-empirical and ab initio atomic structure calculations in Yb-like tungsten W4+
Enzonga Yoca, S; Quinet, Pascal ULg; Palmeri, P et al

in Journal of Physics : B Atomic Molecular & Optical Physics (2012), 45

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See detailRadiative properties and core-polarization effects in W5+ ions
Enzonga Yoca, S; Palmeri, P; Quinet, Pascal ULg et al

in Journal of Physics : B Atomic Molecular & Optical Physics (2012), 45

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See detailConfiguration interaction and radiative decay rates in trebly ionized tungsten (W IV)
Enzonga Yoca, S; Quinet, Pascal ULg; Biémont, Emile ULg

in Journal of Physics : B Atomic Molecular & Optical Physics (2012), 45

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See detailOscillator strengths for lines of astrophysical interest in Rh II
Quinet, Pascal ULg; Biémont, Emile ULg; Palmeri, P et al

in Astronomy and Astrophysics (2012), 537

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See detailStellar laboratories : new Ge V and Ge VI oscillator strengths and their validation in the hot white dwarf RE 0503-289
Rauch, T; Werner, K; Biémont, Emile ULg et al

in Astronomy and Astrophysics (2012), 546

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See detailAtomic data for VUV lines of astrophysical interest in singly ionized rhodium
Quinet, Pascal ULg; Biémont, Emile ULg; Palmeri, P et al

in Journal of Electron Spectroscopy & Related Phenomena (2011), 184

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See detailSpectroscopic data for atomic tungsten transitions of interest in fusion plasma research
Quinet, Pascal ULg; Palmeri, P; Biémont, Emile ULg

in Journal of Physics : B Atomic Molecular & Optical Physics (2011), 44

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See detailLifetime measurements and calculations in Y+ and Y2+ ions
Biémont, Emile ULg; Blagoev, K; Engström, L et al

in Monthly Notices of the Royal Astronomical Society (2011), 414

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See detailRadiative parameters of Nb I excited states
Malcheva, G; Nilsson, H; Engström, L et al

in Monthly Notices of the Royal Astronomical Society (2011), 412

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See detailExperimental and theoretical lifetimes and transition probabilities in Sb I
Hartman, H; Nilsson, H; Engström, L et al

in Physical Review. A (2010), 82

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See detailRadiative lifetime measurements and calculations of odd-parity highly excited levels in Ba I
Zhang, W; Palmeri, P; Quinet, Pascal ULg et al

in Physical Review. A (2010), 82

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See detailLifetime measurements of odd-parity high excitation levels of Sn I by time-resolved laser spectroscopy
Zhang, W; Feng, Y; Xu, J et al

in Journal of Physics : B Atomic Molecular & Optical Physics (2010), 43

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See detailLifetime measurements and transition probabilities in Mo II
Lundberg, H; Engström, L; Hartman, H et al

in Journal of Physics : B Atomic Molecular & Optical Physics (2010), 43

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See detailRadiative decay rates for W I, W II and W III allowed and forbidden transitions of interest for spectroscopic diagnostics in fusion plasmas
Quinet, Pascal ULg; Vinogradoff, V.; Palmeri, P. et al

in Journal of Physics : B Atomic Molecular & Optical Physics (2010), 43

Transition probabilities for allowed and forbidden lines in neutral, singly ionized and doubly ionized tungsten are discussed in the present paper. For the electric dipole transitions, recommended values ... [more ▼]

Transition probabilities for allowed and forbidden lines in neutral, singly ionized and doubly ionized tungsten are discussed in the present paper. For the electric dipole transitions, recommended values are proposed from a critical evaluation of the data available in the literature. For the magnetic dipole and electric quadrupole transitions, for which no data have been published so far, a new set of radiative rates has been obtained using a relativistic Hartree–Fock approach including core-polarization effects. The tables summarizing the compiled data are expected to be useful for plasma modelling in fusion reactors. [less ▲]

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See detailTransition probabilities of astrophysican interest in the niobium ions (Nb II and Nb III)
Nilsson, H.; Hartman, H.; Engström, L. et al

in Astronomy and Astrophysics (2010)

Aims. We attempt to derive accurate transition probabilities for astrophysically interesting spectral lines of Nb ii and Nb iii and determine the niobium abundance in the Sun and metal-poor stars rich in ... [more ▼]

Aims. We attempt to derive accurate transition probabilities for astrophysically interesting spectral lines of Nb ii and Nb iii and determine the niobium abundance in the Sun and metal-poor stars rich in neutron-capture elements. Methods. We used the time-resolved laser-induced fluorescence technique to measure radiative lifetimes in Nb ii. Branching fractions were measured from spectra recorded using Fourier transform spectroscopy. The radiative lifetimes and the branching fractions were combined yielding transition probabilities. In addition, we calculated lifetimes and transition probablities in Nb ii and Nb iii using a relativistic Hartree-Fock method that includes core polarization. Abundances of the sun and five metal-poor stars were derived using synthetic spectra calculated with the MOOG code, including hyperfine broadening of the lines. Results. We present laboratory measurements of 17 radiative lifetimes in Nb ii. By combining these lifetimes with branching fractions for lines depopulating the levels, we derive the transition probabilities of 107 Nb ii lines from 4d35p configuration in the wavelength region 2240−4700 Å. For the first time, we present theoretical transition probabilities of 76 Nb III transitions with wavelengths in the range 1430−3140 Å. The derived solar photospheric niobium abundance log = 1.44 ± 0.06 is in agreement with the meteoritic value. The stellar Nb/Eu abundance ratio determined for five metal-poor stars confirms that the r-process is a dominant production method for the n-capture elements in these stars. [less ▲]

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See detailLandé g-factors along the sixth row of the periodic table
Biémont, Emile ULg; Palmeri, P.; Quinet, Pascal ULg

in Journal of Physics : B Atomic Molecular & Optical Physics (2010), 43

Land´e 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 ... [more ▼]

Land´e 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. [less ▲]

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See detailHD 65949: Rosetta Stone or Red Herring
Cowley, C. R.; Hubrig, S.; Palmeri, P. et al

in Monthly Notices of the Royal Astronomical Society (2010), 405

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 ... [more ▼]

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 100K 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 withZ > 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. [less ▲]

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See detailAtomic structure calculations and Beam-foil observations of La IV
Biémont, Emile ULg; Clar, M.; Enzonga Yoca, S. et al

in Canadian Journal of Physics (2009), 87

Relativistic Hartree–Fock and multiconfigurational Dirac–Fock calculations of atomic structure and transition rates have been carried out in trebly ionized lanthanum (La3+, Z = 57). The calculations have ... [more ▼]

Relativistic Hartree–Fock and multiconfigurational Dirac–Fock calculations of atomic structure and transition rates have been carried out in trebly ionized lanthanum (La3+, 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 <br />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. [less ▲]

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