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P: Fachverband Plasmaphysik

P 22: Poster: Theory/Modelling II

P 22.7: Poster

Donnerstag, 11. März 2010, 16:00–18:00, Lichthof

Static and Dynamic Structure Factors with Account of the Ion Structure for High-temperature Alkali and Earth-alkali Plasmas — •Saltanat Polatovna Sadykova¹, Werner Ebeling¹, and Igor Mijail Tkachenko² — ¹Institut für Physik, Humboldt Universitat zu Berlin, Newtonstr. 15, 12489 Berlin, Germany — ²Department of Applied Mathematics, Polytechnic University of Valencia, 46022 Valencia, Spain

The structure factors (SF) are the fundamental quantities that describes the X-ray scattering cross-section in a plasma. The recent work (G. Gregori et al. Phys. Rev. E 74, 026402 (2006)) has shown that the technique, developed in the classical work of Bogoljubow for determination of the screened Deutsch potential for point-like charges, provides good expressions of SF even for moderately coupled plasmas. However, it is of high interest to take into account the ion shell structure. We calculate the e−e , e−i, i−i and charge-charge static structure factors for Alkali (Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺) at T≥ 30000 K and Be²⁺ at T≥ 100000 K plasmas using the method described by G. Gregori et al. We also study the dynamic structure factors for Alkali plasmas using the Adamjans’ et al method ( S. V. Adamjan et al., Phys. Rev. E 48, 2067 (1993)). For determination of the static and dynamic structure factors we use the screened Hellmann-Gurskii-Krasko potential which takes into an account not only the quantum-mechanical effects but also the ion shell structure (S. Sadykova, Contr.Plasma Phys. 49, 76 (2009)). The results show that at high coupling the ion structure plays significant role and must be taken into account.