MODELING THE RADIATIVE PROPERTIES OF DENSE-PLASMAS

A model aimed at describing the electronic structure of hot dense plas mas 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 er al., Phys, Rev, A 33, 1279 (1986)] are obtained by the present approach for plasma densi ty above solid. We believe that this effect could be of importance in the calculation of the opacity of dense materials. The present model a lso provides an alternative to the treatment of line broadening in ver y dense plasmas where the average interionic spacing can be of the ord er of the spatial extent of the excited-state orbitals. To illustrate this point, we present F Lyman-beta line shapes for various density co nditions.