Berlin 2001 – scientific programme

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P: Plasmaphysik

P 9: Dense Plasmas and Plasma Diagnostic (Poster Session)

P 9.10: Poster

Tuesday, April 3, 2001, 12:30–15:00, AT2

Charge Exchange Induced X-ray Emission of Two Electron Inner-Shell Transitions in Dense Laser Produced Plasmas — •F.B. Rosmej¹, H.R. Griem², R.C. Elton², V.L. Jacobs³, J.A. Cobble⁴, A.Ya. Faenov⁵, T.A. Pikuz⁵, M. Geissel¹, D.H.H. Hoffmann¹, W. Suess¹, D.B. Uskov⁶, and V.P. Shevelko⁶ — ¹TU-Darmstadt — ²University of Maryland, USA — ³Naval Research Laboratory, USA — ⁴Los Alamos National Laboratory, USA — ⁵MCISDC VNIIFTRI Mendeleevo, Russia — ⁶Lebedev Physical Technical Institute, Russia

Order of magnitude anomalously high intensities for the two electron X-ray transitions originating from the He-like 2s2 and Li-like 1s2s2 states of highly charge ions have been observed in laser produced plasmas at the GSI nhelix-laser and the TRIDENT-laser facility in LANL. We find that taking into account density and temperature variations, the plasma optical thickness, and even hot electrons, the simulations are not in agreement with the observations. We propose that highly stripped target ions interpenetrate with dense cold plasma near the surface and undergo single- and double-electron charge transfer processes. The simulations show that in dense and optically-thick plasmas these charge transfer processes may rise the intensity of the two electron transitions up to a factor of ten relative to other emission lines, in accordance with the observations.