Bonn 2000 – scientific programme
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P: Plasmaphysik
P 21: Dichte Plasmen (Poster)
P 21.8: Poster
Thursday, April 6, 2000, 17:00–19:30, Aula
The usability of UV and visible lines of highly ionized carbon in diagnostics of laser–produced plasmas — •Ž. Andreić1, L. Aschke2, and H.-J. Kunze2 — 1Rud1.22exheight 0.09ex width 0.315em0.04emer Bošković Institute, Division of Materials Science, Bijenička 54, 10000 Zagreb, Kroatien — 2Ruhr-Universität Bochum, Institut für Experimentalphysik V, 44780 Bochum
Ultraviolet (UV) or visible (VIS) lines of highly ionized carbon (C V and C VI) were often used for plasma diagnostics in the first studies of laser–produced carbon plasmas. More recently, the spectroscopy of such plasmas moved into the VUV and XUV spectral regions. In some instances UV-VIS, however, lines can be used with advantage for diagnostic purposes. Firstly, such lines originate from high-n levels of corresponding ions, and hence they much easier come into LTE, simplifying the analysis of the spectra. Secondly, they have comparably small transition probabilities and are thus not so much plagued by optical thickness as stronger lines. With this in mind, we recorded a whole UV-VIS spectrum of laser–produced carbon plasmas, produced by the same laser, target material and target geometry as used in older experiments. The new spectra show that high-n carbon lines are comparably weak, as expected. In some experiments we simultaneously recorded XUV spectra also, allowing us to directly compare diagnostic results obtained from XUV and UV-VIS spectra, with a preliminary result that both methods produce similar results. However, further work with simultaneous time-resolved spectroscopy in XUV and UV-VIS regions is needed to strengthen our conclusions.