Hannover 2010 – scientific programme

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P: Fachverband Plasmaphysik

P 7: Poster: Dusty Plasmas

P 7.20: Poster

Tuesday, March 9, 2010, 16:00–18:00, Lichthof

UV and VUV Extinction on Plasma-Polymerized Dust Particles — •Thomas Möller, Brankica Sikimić, Ilija Stefanović, and Jörg Winter — Institut für Experimental Physik II, Ruhr Universität Bochum, Germany

The production of nanoparticles in low temperature plasmas has found various applications in different fields - technological processes, fusion technology and astrophysics. Dust particles are significant constituents of interstellar media and their composition and structure is of a key importance. In the past we proposed a candidate analog for carbonaceous interstellar dust by reactive plasma polymerization, using acetylene as a precursor material [1]. The experimental IR fingerprint has shown a good match to the data obtained from astrophysical observation. Further analysis of dust particles has been done by extinction measurements in VUV spectral range. The rationale is the observation in astrophysics of a dominant UV extinction bump at 217.5 nm, whose origin is still unclear and has been subject of research. For this purpose, a new experimental setup is installed and tested. The first measurements of the scattering of the UV and VUV radiation by the dust particles in the discharge are presented here. The extinction measurements for particles of different composition and different size are shown. Further investigations will focus on the amount of carbon and its binding structure in the nanoparticles and their correlation with UV scattering. [1] Kovacevic et al. Astrophysical Jour. 623 (2005) 242