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P: Fachverband Plasmaphysik

P III: Poster: Diagnostik, Theorie, Schwerionen- und lasererzeugte Plasmen, Sonstiges

P III.11: Poster

Tuesday, March 11, 2008, 11:00–13:00, Poster C3

Whispering-Gallery-Mode Spectroscopy on microparticles levitated in a plasma — •Gabriele Thieme¹, Ralf Basner¹, Jörg Ehlbeck¹, Jürgen Röpcke¹, Holger Kersten², Jonathan P. Reid³, and Paul B. Davies⁴ — ¹INP Greifswald, F.-Hausdorff-Str. 2, 17489 Greifswald — ²IEAP, Christian-Albrechts-Universität Kiel, 24098 Kiel — ³School of Chemistry, University of Bristol, Bristol BS8 1TS, UK — ⁴Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK

Whispering-Gallery-Mode Raman Spectroscopy is a non-invasive diagnostic technique for the characterisation of size and chemical composition of spherical paricles of sizes between ca. 5 and 100 µ m. By means of a pulsed laser whispering gallery modes are excited within the particles which lead to an enhanced Raman signal at characteristic wavelengths. We show that this method can be used to gain information in particular from the particle surface. Therefore it is of great interest for the characterisation of thin layers deposited on microparticles, e.g. in molecular plasmas. We present investigations of different microparticles in air and results from particles levitated in an Argon rf-plasma.