Modeling the radiative properties of dense plasmas

Abstract

A model aimed at describing the electronic structure of hot dense plasmas is presented. This model is first used to study the effect of the nearest neighbor interaction on the photoabsorption K-edge position in a dense fluorine plasma. Changes to the ionization potential lowering from the well-known ion sphere model ͓H. Nguyen et al., Phys. Rev. A 33, 1279 ͑1986͔͒ are obtained by the present approach for plasma density above solid. We believe that this effect could be of importance in the calculation of the opacity of dense materials. The present model also provides an alternative to the treatment of line broadening in very dense plasmas where the average interionic spacing can be of the order of the spatial extent of the excited-state orbitals. To illustrate this point, we present F Lyman-␤ line shapes for various density conditions.

Optical Transitions and Charge-Exchange in Highly Charged Quasi-Molecules

“…From this point of view, the transition must be attributed to optical forbidden transitions that are mainly concentrated near the position of the dipole moment extremum. Certainly, those two transitions (19) and (20) do not interfere with each other in contrast to the ones discussed previously, so that there will be in general only one satellite produced by the reaction (20) and shifted from the position of an optical transition in a separate ion Z 1 e(n 1i ) → Z 1 e(n 1 f ). A typical example of the reaction (20) is the following reaction relevant to thermonuclear physics:…”

<title>Status and overview of research programs at LULI 2000</title>

“…The interest of high material density effects has been recently enhanced by spectroscopic measurements (line profiles, emission and absorption coefficients) from astrophysical or laboratory sources [30][31][32][33][34] corresponding to dense hot plasma situations For low Z materials (Z l6) the ionic correlation effects may provide new diagnostics for the measure of plasma macroscopic parameters or the knowledge of atomic/molecular processes, all these data being crucial for the knowledge of the state equations and the energy transfer in dense hot plasmas. An expertise has been achieved at LULl for the generation of ultradense hot plasma at high intensities ( l014Wcm2).…”

Dense matter characterization by X-ray Thomson scattering

“…Various statistical mechanics models [18][19][20] differ by factors of several in the predicted electron-ion collisionality in this regime. Material properties such as electrical [21][22][23][24] and thermal conductivity [25,26], opacity [27][28][29][30], and equation-of-state (EOS) [31,32] have been studied in this regime to attempt to resolve theoretical and calculational uncertainties. However, the usefulness of such measurements has been impaired because of the lack of an independent measurement of temperature and density.…”