References of "Garnir, Henri-Pierre"
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See detailLe GPS et la Physique
Garnir, Henri-Pierre ULg; Strivay, David ULg; Bastin, Thierry ULg

in Science and Culture (2002), 380

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See detailRadiative lifetime measurements in Tm III with time-resolved laser spectroscopy and comparisons with HFR calculations
Li, Z. S.; Zhang, Z. G.; Lokhnygin, V. et al

in Journal of Physics : B Atomic Molecular & Optical Physics (2001), 34

Natural radiative lifetimes of eight levels in Tm III were measured with the time-resolved laser-induced fluorescence (LIF) technique. Free doubly ionized thulium ions were obtained in a laser-produced ... [more ▼]

Natural radiative lifetimes of eight levels in Tm III were measured with the time-resolved laser-induced fluorescence (LIF) technique. Free doubly ionized thulium ions were obtained in a laser-produced plasma. Three even-parity levels were excited from the ground state with one-photon excitation, using a laser system generating pulses of 1 ns duration. Five odd-parity levels were excited from the ground state with two-photon excitation, where a picosecond laser system was employed. In both cases, the lifetimes were evaluated from transient LIF signals detected with a fast-detection system. The experimental lifetime results were compared with Hartree–Fock calculations including relativistic corrections. Good agreement was achieved for the 4f126p levels while larger discrepancies are noted for some 4f125d levels. [less ▲]

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See detailRadiative lifetime measurements and transition probabilities of astrophysical interest in Er III
Biémont, Emile ULg; Garnir, Henri-Pierre ULg; Bastin, Thierry ULg et al

in Monthly Notices of the Royal Astronomical Society (2001), 321

Radiative lifetimes of seven excited states of Er III have been measured using time-resolved laser-induced fluorescence following two-photon excitation. Relativistic Hartree-Fock calculations taking core ... [more ▼]

Radiative lifetimes of seven excited states of Er III have been measured using time-resolved laser-induced fluorescence following two-photon excitation. Relativistic Hartree-Fock calculations taking core-polarization effects into account are found to be in excellent agreement with the experimental results. A large set of new calculated transition probabilities is presented for many transitions of astrophysical interest. These results will be useful for investigating the composition of chemically peculiar stars. [less ▲]

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See detailSinglet-triplet excitation ratios in Ne III, Ar III and N II under ion impact
Träbert, E.; Garnir, Henri-Pierre ULg; Dumont, Paul-Dominique ULg et al

in European Physical Journal D -- Atoms, Molecules, Clusters & Optical Physics (2001), 15

Peculiar properties of ion-atom collision systems, in particular deviations from statistical populations of singlet and triplet levels, can be studied by optical spectroscopy.We have extended earlier ... [more ▼]

Peculiar properties of ion-atom collision systems, in particular deviations from statistical populations of singlet and triplet levels, can be studied by optical spectroscopy.We have extended earlier studies by VUV spectroscopy of a number of collision systems at various collision energies in the 0.01-MeV/nucleon to 1-MeV/nucleon range, involving H+ 2 , H+, He+, He2+, Ne+, Ar+, and N+ 2 as projectiles and Ne, Ar, and N2 as target gases. Statistically signi cant deviations of the relative intensities of singlet and triplet lines from simple ratios are observed in the displaced terms of the valence shell of Ne III, corroborating and extending earlier work. For Ar III, the energy dependences of singlet-to-triplet excitation ratios are very different for dff erent projectiles. For NII, in contrast, all observed line ratios are practically independent of the projectile energy. [less ▲]

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See detailEquilibrium charge-state distributions of sodium ions in carbon foil
Tordoir, Xavier ULg; Bastin, Thierry ULg; Dumont, Paul-Dominique ULg et al

in Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms (2001), 173

The equilibrium charge-state distributions have been measured for sodium ions at the exit of a carbon foil for energies ranging from 0.43 to 1.66 Me V. A comparison of our results with available models is ... [more ▼]

The equilibrium charge-state distributions have been measured for sodium ions at the exit of a carbon foil for energies ranging from 0.43 to 1.66 Me V. A comparison of our results with available models is performed and an empirical formula for calculating the charge-state fractions of sodium ions is deduced. [less ▲]

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See detailBeam-gas excitation of Ar III 3s3p5 singlet and triplet terms
Garnir, Henri-Pierre ULg; Träbert, E.; Dumont, Paul-Dominique ULg et al

Poster (2001)

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See detailBeam-gas excitation of Ar III 3s3p5 singlet and triplet terms
Garnir, Henri-Pierre ULg; Träbert, E.; Dumont, Paul-Dominique ULg et al

Poster (2001)

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See detailExperimental and Theoretical Energy Levels, Transition probabilities and Radiative Lifetimes in Yb III
Biémont, Emile ULg; Garnir, Henri-Pierre ULg; Li, Z. S. et al

in Journal of Physics : B Atomic Molecular & Optical Physics (2001), 34

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See detailCore-polarization effects and radiative lifetime measurements in Pr III
Biémont, Emile ULg; Garnir, Henri-Pierre ULg; Palmeri, P. et al

in Physical Review. A (2001), 64

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See detailNew f values in neutral lead obtained by time-resolved laser spectroscopy, and astrophysical applications
Biémont, Emile ULg; Garnir, Henri-Pierre ULg; Palmeri, P. et al

in Monthly Notices of the Royal Astronomical Society (2000), 312

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See detailIs the external beam PIXE method suitable for determining ancient silver artifact fineness?
Weber, Georges ULg; Guillaume, J.; Strivay, David ULg et al

in Nuclear Instruments & Methods in Physics Research Section B (2000), 161

In archeometry, the non-destructive characteristic of an analytical method is always very attractive. For most of techniques, besides the need of sampling, difficulties can originate from the shape and ... [more ▼]

In archeometry, the non-destructive characteristic of an analytical method is always very attractive. For most of techniques, besides the need of sampling, difficulties can originate from the shape and the size of the silver artifacts to be analyzed. The external PIXE method should be an answer to this problem but several questions are arising from the implementation of the technique to such a material. The aim of this paper is to specify the experimental procedure as to take into account several parameters, which could induce dramatic errors. Among them it can be pointed out the superficial enrichment in silver, arising from the dissolution of copper and copper oxide, the surface roughness effects, the great importance of the stability of the geometric conditions. The accuracy and the precision of the method are considered within the scope of the results obtained in ancient times by the cupellation with ashbone cupels. In addition. the process involved to obtain silver alloys has been studied in order to define its influence on the real fineness of the objects. (C) 2000 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailA critical compilation and extended analysis of the Ne V spectrum
Kramida, A. E.; Bastin, Thierry ULg; Biémont, Emile ULg et al

in European Physical Journal D -- Atoms, Molecules, Clusters & Optical Physics (1999), 7

Previous works devoted to the Ne V spectrum are very fragmentary and yield a rather controversial picture of this ion. A lot of unidentifi ed lines are still reported in these multiple studies. In the ... [more ▼]

Previous works devoted to the Ne V spectrum are very fragmentary and yield a rather controversial picture of this ion. A lot of unidentifi ed lines are still reported in these multiple studies. In the present paper, Hartree-Fock calculations and least-squares fi ts over the whole set of the available data (including the most recent ones) have been performed. As a result, a comprehensive view of the Ne V spectrum is presented. 10 new energy levels and 40 newly classi fied lines are proposed. An improved value of the ionisation potential of Ne V is also proposed. [less ▲]

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See detailA critical compilation and extended analysis of the Ne IV spectrum
Kramida, A. E.; Bastin, Thierry ULg; Biémont, Emile ULg et al

in European Physical Journal D -- Atoms, Molecules, Clusters & Optical Physics (1999), 7

Since Moore published her well-known tables of atomic and ionic energy levels (in 1949-1951), the number of observed lines of the light atoms and their ions has grown signifi cantly. The lack of complete ... [more ▼]

Since Moore published her well-known tables of atomic and ionic energy levels (in 1949-1951), the number of observed lines of the light atoms and their ions has grown signifi cantly. The lack of complete and consistent up-to-date tables of spectral lines and energy levels, particularly of the neon-ions spectra, notably reduces possibilities of interpretation of astrophysical and laboratory spectra. In the present paper, all optical spectral lines of Ne IV observed in 24 previous works have been systematised together with recent observations made by means of the beam-foil method at Liège University. As a result of our extended analysis of the whole set of available data, 35 new energy levels have been found and 90 newly classi ed spectral lines have been listed for the Ne IV spectrum, only a few of them having been reported previously. A complete table of observed and classi ed spectral lines has been built, and the list of optimised energy levels has been derived from it in a consistent way. A new, improved, ionisation potential of Ne IV has been deduced from the experimental data. [less ▲]

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See detailNe VI spectrum
Kramida, A. E.; Bastin, Thierry ULg; Biémont, Emile ULg et al

in Journal of the Optical Society of America. B, Optical Physics (1999), 16

On the basis of all the available observations of the Ne VI spectrum, particularly the new beam-foil spectra obtained at Liège University, approximately 50 new line assignments are proposed and ... [more ▼]

On the basis of all the available observations of the Ne VI spectrum, particularly the new beam-foil spectra obtained at Liège University, approximately 50 new line assignments are proposed and approximately 30 new energy levels are determined in Ne VI. All known energy levels have been improved, and a new value is proposed for the ionization potential. The new line identifications are supported by Hartree–Fock calculations combined with parametric fitting of energies and transition rates. [less ▲]

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See detailExtended Analysis of the Highly Ionized Neon Spectra
Kramida, A. E.; Bastin, Thierry ULg; Biémont, Emile ULg et al

Poster (1999)

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See detailCCD Detection of beam-foil light
Quevrin, A.; Bastin, Thierry ULg; Dumont, Paul-Dominique ULg et al

Poster (1999)

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