60 citations · 342 across the 26 of their papers we have counts for
27 papers
Helioseismic inference of the solar radiative opacity
Gaël Buldgen, Jean-Christophe Pain, Philippe Cossé +18
The Sun is the most studied of all stars, and thus constitutes a benchmark for stellar models. However, our vision of the Sun is still incomplete, as illustrated by the current deb…
New sum rules for Wigner 3jm symbols: application to expectation values of hydrogenic ions
Jean-Christophe Pain, Franck Gilleron
We present new sum rules for coefficients, which involve, in addition to the usual weighting factor where is an angular momentum, the quantity w…
Optimized recursion relation for the computation of partition functions in the superconfiguration approach
Jean-Christophe Pain, Franck Gilleron, Brian G. Wilson
Partition functions of a canonical ensemble of non-interacting bound electrons are a key ingredient of the super-transition-array approach to the computation of radiative opacity.…
Electron broadening operator including penetrating collisions for hydrogen
Jean-Christophe Pain, Franck Gilleron
The expression of the electron broadening operator including the effect of penetrating collisions, i.e. for which the incoming electron enters the extent of bound-electron wavefunc…
A quantitative study of some sources of uncertainty in opacity measurements
Jean-Christophe Pain, Franck Gilleron
Laboratory (laser and Z-pinch) opacity measurements of well-characterized plasmas provide data to assist inertial confinement fusion, astrophysics and atomic-physics research. In o…
Opacity calculations for stellar astrophysics
Jean-Christophe Pain, Franck Gilleron
Opacity is a key ingredient of stellar structure and evolution. In the present work, we recall the role of opacity in asteroseismology, focusing mainly on two kinds of astrophysica…
Modeling penetrating collisions in the standard line broadening impact theory for hydrogen
Jean-Christophe Pain, Franck Gilleron
Spectral lines emitted by plasmas provide information about the thermodynamic conditions, the degree of randomness or the interactions prevailing in the medium. Collisions by plasm…
Detailed Opacity Calculations for Stellar Models
Jean-Christophe Pain, Franck Gilleron, Maxime Comet
Radiative opacity is an important quantity in the modeling of stellar structure and evolution. In the present work we recall the role of opacity in the interpretation of pulsations…
A project based on Multi-Configuration Dirac-Fock calculations for plasma spectroscopy
Maxime Comet, Jean-Christophe Pain, Franck Gilleron +1
We present a project dedicated to hot plasma spectroscopy based on a Multi-Configuration Dirac-Fock (MCDF) code, initially developed by J. Bruneau. The code is briefly described an…
Detailed opacity calculations for astrophysical applications
Jean-Christophe Pain, Franck Gilleron, Maxime Comet
Nowadays, several opacity codes are able to provide data for stellar structure models, but the computed opacities may show significant differences. In this work, we present state-o…
Statistical properties of levels and lines in complex spectra
Jean-Christophe Pain, Franck Gilleron
We review recent developments of the statistical properties of complex atomic spectra, based on the pioneering work of Claire Bauche-Arnoult and Jacques Bauche. We discuss several…
Comment on "Large enhancement in high-energy photoionization of Fe XVII and missing continuum plasma opacity"
C. Blancard, J. Colgan, Ph. Cossé +12
Recent R-matrix calculations claim to produce a significant enhancement in the opacity of Fe XVII due to atomic core excitations [S. N. Nahar & A.K. Pradhan, Phys. Rev. Letters 116…
K-shell spectroscopy in hot plasmas: Stark effect, Breit interaction and QED corrections
Jean-Christophe Pain, Franck Gilleron, Maxime Comet +1
The broadening of lines by Stark effect is widely used for inferring electron density and temperature in plasmas. Stark-effect calculations often rely on atomic data (transition ra…
Accounting for highly excited states in detailed opacity calculations
Jean-Christophe Pain, Franck Gilleron
In multiply-charged ion plasmas, a significant number of electrons may occupy high-energy orbitals. These "Rydberg" electrons, when they act as spectators, are responsible for a nu…
Detailed computation of hot-plasma atomic spectra
Jean-Christophe Pain, Franck Gilleron, Thomas Blenski
We present recent evolutions of the detailed opacity code SCO-RCG which combines statistical modelings of levels and lines with fine-structure calculations. The code now includes t…
The Hybrid Detailed / Statistical Opacity Code SCO-RCG: New Developments and Applications
Jean-Christophe Pain, Franck Gilleron, Quentin Porcherot +1
We present the hybrid opacity code SCO-RCG which combines statistical approaches with fine-structure calculations. Radial integrals needed for the computation of detailed transitio…
The hybrid opacity code SCO-RCG: recent developments
Jean-Christophe Pain, Franck Gilleron, Quentin Porcherot +1
Absorption and emission spectra of multicharged-ion plasmas contain a huge number of electron configurations and electric-dipolar lines, which can be handled by global methods. How…
Description of anomalous Zeeman patterns in stellar astrophysics
Jean-Christophe Pain, Franck Gilleron
The influence of a magnetic field on the broadening of spectral lines and transition arrays in complex spectra is investigated. The anomalous absorption or emission Zeeman pattern…
Statistics of electric-quadrupole lines in atomic spectra
Jean-Christophe Pain, Franck Gilleron, Jacques Bauche +1
In hot plasmas, a temperature of a few tens of eV is sufficient for producing highly stripped ions where multipole transitions become important. At low density, the transitions fro…
Characterization of anomalous Zeeman patterns in complex atomic spectra
Jean-Christophe Pain, Franck Gilleron
The modeling of complex atomic spectra is a difficult task, due to the huge number of levels and lines involved. In the presence of a magnetic field, the computation becomes even m…
Comparison of Fe and Ni opacity calculations for a better understanding of pulsating stellar envelopes
D. Gilles, S. Turck-Chièze, G. Loisel +19
Opacity is an important ingredient of the evolution of stars. The calculation of opacity coefficients is complicated by the fact that the plasma contains partially ionized heavy io…
Iron and Nickel spectral opacity calculations in conditions relevant for pulsating stellar envelopes and experiments
D. Gilles, S. Turck-Chièze, M. Busquet +18
Seismology of stars is strongly developing. To address this question we have formed an international collaboration OPAC to perform specific experimental measurements, compare opaci…
Generating functions for canonical systems of fermions
Jean-Christophe Pain, Franck Gilleron, Quentin Porcherot
The method proposed by Pratt to derive recursion relations for systems of degenerate fermions [Phys. Rev. Lett. 84, 4255 (2000), arXiv:nucl-th/9905055] relies on diagrammatic techn…
A consistent approach for mixed detailed and statistical calculation of opacities in hot plasmas
Quentin Porcherot, Jean-Christophe Pain, Franck Gilleron +1
Absorption and emission spectra of plasmas with multicharged-ions contain transition arrays with a huge number of coalescent electric-dipole (E1) lines, which are well suited for t…