Photoabsorption in Hot Dense Plasmas
نویسنده
چکیده
This is a preliminary version of the time-dependent local-density approximation designed to study photoabsorption in hot dense plasmas. The theory developed so far is applied to study the photoexcitation in aluminum and helium plasmas and photoionization in aluminum plasmas. 1 Self-consistent LDA at finite temperatures These notes describe a version of the time-dependent local-density approximation (TDLDA) that can be used to give a multichannel description of photoexcitation and photoionization in a dense plasma. A similar, but less complete, study was carried out earlier by Grimaldi, Grimaldi-Lecourt, and Dharmawardana [1] and used to study light absorption in an iron plasma. Our point of departure is a muffin-tin local-density approximation (LDA) model for a dense plasma. In this model, an average atom in the plasma is described by a collection of electrons in a neutral, spherically symmetric, potential produced by the nucleus and a thermal distribution of bound and continuum electrons. The electrons are constrained to lie inside a Wigner-Seitz sphere of volume v and radius R determined by the material density ρm (g/cm) and atomic weight A (g/mol): v = A Aρm , R = ( 3v 4π )1/3 , where A = 6.022 × 10 is Avagadro’s number. The equations defining our model are solved self-consistently to determine energy levels, level populations, and the self-consistent potential. Our model is similar to, but less complete than, other average atom models, such as inferno [2], that have been introduced over the years. The present model is a generalization of the ThomasFermi model of a hot dense plasma, introduced a half century ago by Feynman, Metropolis, and Teller [3] and elucidated by Cowan and Ashkin [4].
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تاریخ انتشار 2001