J/A+A/634/A117ivo://CDS.VizieR/J/A+A/634/A117doi:10.26093/cds/vizier.36340117CDSZeng J.Li Y.Gao C.Yuan J.2020-04-30T07:56:35Z2020-02-19T08:02:19ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fratomic-physicsthe-sunAn accurate description of the screening potential induced by a hot, dense plasma is a fundamental problem in atomic physics and plasma physics, and it plays a pivotal role in the investigation of microscopic atomic processes and the determination of macroscopic physical properties, such as opacities and equations of state as well as nuclear fusion cross sections. Recent experimental studies show that currently available analytical models of plasma screening have difficulty in accurately describing the ionization-potential depression, which is directly determined by the screening potential. Here, we propose a consistent approach to determine the screening potential in dense plasmas under solar-interior conditions from the free-electron micro-space distribution. It is assumed that the screening potential for an ion embedded in a dense plasma is predominately determined by the free electrons in the plasma. The free-electron density is obtained by solving the ionization-equilibrium equation for an average-atom model to obtain the average degree of ionization of the plasma. The proposed model was validated by comparing the theoretically predicted ionization-potential depression of a solid-density Si plasma with recent experiments. Our approach was applied to investigate the screening potential and ionization-potential depression of Si plasmas under solar-interior conditions over a temperature range of 150-500eV and an electron-density range of 5.88x10^22^-3.25x10^24^cm^-3^. It can be easily incorporated into atomic-structure codes and used to investigate basic atomic processes, such as photoionization, electron-ion collisional excitation and ionization, and Auger decay, in a dense plasma.2020A&A...634A.117Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/634/A117CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/634/A117https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/634/A117http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/634/A117https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/634/A117https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/634/A117http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/634/A117GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/634/A117/fig1Comparison of ionization potential depressions for solid-density Si plasmasrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStageIonization stagephys.atmol.ionStage;phys.atmol.ionizationintIPD? Results using the present modeleVphys.energy;phys.atmol.levelfloatnullableExpt? The experimental resultseVphys.energy;phys.atmol.leveldoublenullableEK? Ecker & Kroll modeleVstat.param;meta.modelleddoublenullableISIon-sphere modeleVstat.param;meta.modelleddoubleSPStewart & Pyatt modeleVstat.param;meta.modelleddoubleJ/A+A/634/A117/fig2Screening potential in Si plasmasrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintrRadial Coordinateaupos.distancedoubleP156Screening potential at 156.90eV, 5.88E22cm^-3^austat.paramfloatP189? Screening potential at 189.00eV, 8.00E22cm^-3^austat.paramfloatnullableP205? Screening potential at 205.12eV, 9.89E22cm^-3^austat.paramfloatnullableP227? Screening potential at 227.53eV, 1.36E23cm^-3^austat.paramfloatnullableP244? Screening potential at 244.94eV, 1.70E23cm^-3^austat.paramfloatnullableP275? Screening potential at 275.80eV, 2.76E23cm^-3^austat.paramfloatnullableP304? Screening potential at 304.23eV, 4.06E23cm^-3^austat.paramfloatnullableP334? Screening potential at 334.40eV, 6.12E23cm^-3^austat.paramfloatnullableP373? Screening potential at 373.18eV, 9.79E23cm^-3^austat.paramfloatnullableP407? Screening potential at 407.65eV, 1.43E24cm^-3^austat.paramfloatnullableP438? Screening potential at 438.70eV, 1.96E24cm^-3^austat.paramfloatnullableP468? Screening potential at 468.84eV, 2.57E24cm^-3^austat.paramfloatnullableP496? Screening potential at 496.42eV, 3.25E24cm^-3^austat.paramfloatnullableJ/A+A/634/A117/fig3Ionization-potential depressions of Si plasmasrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStageIonization stagephys.atmol.ionStage;phys.atmol.ionizationintIPD156Ionization-potential depression at 156.90eV, 5.88E22cm^-3^eVphys.energy;phys.atmol.levelfloatIPD189Ionization-potential depression at 189.00eV, 8.00E22cm^-3^eVphys.energy;phys.atmol.levelfloatIPD205Ionization-potential depression at 205.10eV, 9.89E22cm^-3^eVphys.energy;phys.atmol.levelfloatIPD227Ionization-potential depression at 227.50eV, 1.36E23cm^-3^eVphys.energy;phys.atmol.levelfloatIPD244Ionization-potential depression at 244.9eV, 1.70E23cm^-3^eVphys.energy;phys.atmol.levelfloatIPD275Ionization-potential depression at 275.80eV, 2.76E23cm^-3^eVphys.energy;phys.atmol.levelfloatIPD304? Ionization-potential depression at 304.20eV, 4.06E23cm^-3^eVphys.energy;phys.atmol.levelfloatnullableIPD334? Ionization-potential depression at 334.40eV, 6.12E23cm^-3^eVphys.energy;phys.atmol.levelfloatnullableIPD373? Ionization-potential depression at 373.18eV, 9.79E23cm^-3^eVphys.energy;phys.atmol.levelfloatnullableIPD407? Ionization-potential depression at 407.65eV, 1.43E24cm^-3^eVphys.energy;phys.atmol.levelfloatnullableIPD438? Ionization-potential depression at 438.70eV, 1.96E24cm^-3^eVphys.energy;phys.atmol.levelfloatnullableIPD468? Ionization-potential depression at 468.84eV, 2.57E24cm^-3^eVphys.energy;phys.atmol.levelfloatnullableIPD496? Ionization-potential depression at 496.42eV, 3.25E24cm^-3^eVphys.energy;phys.atmol.levelfloatnullableJ/A+A/634/A117/fig4Comparison of our theoretical ionization-potential depression with the analytical modelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStageIonization stagephys.atmol.ionStage;phys.atmol.ionizationintIPD156Ionization-potential depression of this work at 156.90eV, 5.88E22cm^-3^eVphys.energy;phys.atmol.levelfloatDH156Debye & Huckel modeleVstat.param;meta.modelledfloatSP156Stewart & Pyatt modeleVstat.param;meta.modelledfloatIS156Ion-sphere modeleVphys.energy;phys.atmol.levelfloatEK156Ecker & Kroll modeleVstat.param;meta.modelledfloatIPD227Ionization-potential depression of this work at 227.50eV, 1.36E23cm^-3^eVphys.energy;phys.atmol.levelfloatDH227Debye & Huckel modeleVstat.param;meta.modelledfloatSP227Stewart & Pyatt modeleVstat.param;meta.modelledfloatIS227Ion-sphere modeleVphys.energy;phys.atmol.levelfloatEK227Ecker & Kroll modeleVstat.param;meta.modelledfloatIPD407Ionization-potential depression of this work at 407.65eV, 1.43E24cm^-3^eVphys.energy;phys.atmol.levelfloatDH407Debye & Huckel modeleVstat.param;meta.modelledfloatSP407Stewart & Pyatt modeleVstat.param;meta.modelledfloatIS407Ion-sphere modeleVphys.energy;phys.atmol.levelfloatEK407Ecker & Kroll modeleVstat.param;meta.modelledfloatIPD496Ionization-potential depression of this work at 496.42eV, 3.25E24cm^-3^eVphys.energy;phys.atmol.levelfloatDH496Debye & Huckel modeleVstat.param;meta.modelledfloatSP496Stewart & Pyatt modeleVstat.param;meta.modelledfloatIS496Ion-sphere modeleVphys.energy;phys.atmol.levelfloatEK496Ecker & Kroll modeleVstat.param;meta.modelledfloat