Augsburg 2006 – wissenschaftliches Programm

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P: Plasmaphysik

P 27: Staubige Plasmen 3

P 27.3: Vortrag

Mittwoch, 29. März 2006, 17:30–17:45, 1004

Plasma polymerized nanoparticles as astroanalog material — •Eva Kovacevic¹, Ilija Stefanovic¹, Johannes Berndt¹, Hans-Werner Becker², Christoph Somsen³, Yvonne J. Pendleton⁴, and Jörg Winter¹ — ¹Institut für Experimental Physik II, Ruhr Universität Bochum — ²Institut für Experimental Physik III, Ruhr Universität Bochum — ³Institut für Werkstoffe, Ruhr Universität Bochum — ⁴NASA Ames Research Center, Moffett Field, CA, USA

Carbonaceous compounds are a significant component of interstellar (IS) dust and the composition and structure of such materials is therefore of key importance. Our plasma polymerization process has similarities to stellar outflow conditions and provides a convenient way to make carbonaceous IS analogs under controlled conditions and to compare their characteristics to astronomical observations. We report about experiments in low temperature plasmas with low ionized buffer gases (like Ar or He). Such plasmas provide an excellent trap for the nanoparticles (No-dqplasma matrix isolationNo-dq), enabling investigations of the UV extinction feature, scattering measurements as well as manipulation of the particles, e.g. with atomic hydrogen. The chemistry of polymerization can be followed in-situ by means of mass spectroscopy, optical spectroscopy, and IR spectroscopy (from near to far IR region). The role of the carrier gas on the polymerisation is of great interest for the dusty plasma community, especially in the case of gases undergoing copolymerization. An example is N2/C2H2 plasma where nitrogen has a double role: as carrier gas and as potential partner forming multicomponent monomer. This study is supported by DFG within SFB 591 (B1,B5).