Berlin 2005 – wissenschaftliches Programm

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P: Plasmaphysik

P 23: Poster: Magnetischer Einschluß 3, Staubige Plasmen 2, Astrophysikalische Plasmen 1

P 23.12: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster HU

Investigations of dusty plasmas using THz Time-Domain spectroscopy — •Simon Ebbinghaus¹, Konstanze Schröck¹, Erik Bründermann¹, Martina Havenith¹, Janine-Christina Schauer², Marc Böke², and Jörg Winter² — ¹Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum — ²Institut für Experimentalphysik II, Ruhr-Universität Bochum

For the first time we used THz Time-Domain spectroscopy as a tool for dusty plasma diagnosis in the THz-frequency region. The dust particles were produced in mixtures of Ar and C₂H₂ and CH₄, respectively. We used a capacitively coupled GEC-Cell powered by 20 Watt at 13.56 MHz. A 20 fs TiSa-laser was used as the pulse source producing ultrashort, broadband THz-pulses, that are transmitted through the plasma chamber and detected coherently through a second femtosecondpulse. Rotational lines of different hydrocarbons were observed including positive ions and radicals. For CCH several rotational transitions in the region from 3 to 40 cm⁻¹ were observed, which yield information on the condition of the plasma. The experiments are thought to implement a new technique for plasma diagnostics in future.