References of "Dumont, Paul-Dominique"
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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 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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See detailThe Spectra Ne IV, Ne V ans Ne VI
Kramida, A. E.; Bastin, Thierry ULg; Biémont, Emile ULg et al

Conference (1998)

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See detailSpectroscopy of Ne IV in the wavelength Range 450–1100 Å
Bastin, Thierry ULg; Biémont, Emile ULg; Dumont, Paul-Dominique ULg et al

in Journal of the Optical Society of America. B, Optical Physics (1997), 14

An analysis of the Ne IV spectrum was undertaken in the 450–1100-Å spectral range. The spectra were produced by the beam–foil method with beam energies of 1.2 and 2.5 MeV, respectively. The resolution ... [more ▼]

An analysis of the Ne IV spectrum was undertaken in the 450–1100-Å spectral range. The spectra were produced by the beam–foil method with beam energies of 1.2 and 2.5 MeV, respectively. The resolution that was achieved, with a normal-incidence 2-m spectrometer, was sufficient to identify 53 new Ne IV lines and, consequently, to determine 18 new levels in the quartet and doublet systems and one sextet term. The energy values of 13 additional levels were also revised. The classification work was facilitated by the use of scaled relativistic Hartree–Fock calculations. [less ▲]

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See detailAutomatic external filling for the ion source gas bottle of a Van de Graaff accelerator
Bastin, Thierry ULg; Dehove, C.; Dumont, Paul-Dominique ULg et al

in Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms (1997), 129

We describe a fully automatic system we developed to fill, from an external gas bottle, the ion sourer terminal gas storage bottle of a 2 MV Van de Graaff accelerator without depressing the 25 bar ... [more ▼]

We describe a fully automatic system we developed to fill, from an external gas bottle, the ion sourer terminal gas storage bottle of a 2 MV Van de Graaff accelerator without depressing the 25 bar insulating gas. The system is based on a programmable automate ordering electropneumatical valves. The only manual operation is the connection of the external gas cylinder. The time needed for a gas change is reduced to typically 15 min (depending on the residual pressure wished for the gas removed from the terminal bottle). To check this system we study the ionic composition of the ion beam delivered by our accelerator after different gas changes. The switching magnet of our accelerator was used to analyse the ionic composition of the accelerated beams in order to verify the degree of elimination of the previous gases in the system. (C) 1997 Elsevier Science B.V. [less ▲]

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See detailThe Spectrum of Ne V
Bastin, Thierry ULg; Biémont, Emile ULg; Dumont, Paul-Dominique ULg et al

in Physica Scripta (1997), 55

A new investigation of the Ne V spectrum is reported. The beam-foil method has been used to produce spectra at two different energies (1.2 MeV and 2.5 MeV) between 450 and 11OOA Sixty-five lines of Ne V ... [more ▼]

A new investigation of the Ne V spectrum is reported. The beam-foil method has been used to produce spectra at two different energies (1.2 MeV and 2.5 MeV) between 450 and 11OOA Sixty-five lines of Ne V have been newly identified. Fifty levels have been determined for the first time and energies have been revised for seven levels. [less ▲]

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See detailDye Laser Wavelength Scanning
Carapelle, Alain ULg; Bastin, Thierry ULg; Garnir, Henri-Pierre ULg et al

Poster (1996)

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See detailNew Level Determinations in Ne V
Bastin, Thierry ULg; Biémont, Emile ULg; Dumont, Paul-Dominique ULg et al

Poster (1996)

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See detailThe Spectrum of Ne V
Bastin, Thierry ULg; Biémont, Emile ULg; Dumont, Paul-Dominique ULg et al

Poster (1996)

Detailed reference viewed: 3 (2 ULg)