Erlangen 2018 – scientific programme

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P: Fachverband Plasmaphysik

P 22: Complex Plasmas and Dusty Plasmas - Poster

P 22.1: Poster

Wednesday, March 7, 2018, 16:15–18:15, Zelt West

Operando size meansurements of microparticles using angular resolved mie scattering — •Niklas Kohlmann, Oguz Han Asnaz, Franko Greiner, and Dietmar Block — Institute of Experimental and Applied Physics, Kiel University, Germany

Besides structural and dynamic processes in complex plasmas, the particles themselves are recently more and more in focus of research. Important parameters are the particle size, shape and surface topology. However, non-invasive in-situ or even operando methods to determine the named parameters during plasma operation are missing. Angular resolved mie scattering measurements can fill this gap and provide particle sizes with high precision. An out-of-focus imaging technique similar to ILIDS is used to obtain the angular-dependent scattering intensities. Correlating the so called phase function to the data provided by the Lorenz-Mie theory for spherical objects the particle size and refractive index can be obtained. The particle size measurements are validated with complimentary measurements using a long distance microscope. It is found that the sizes are in good agreement for both methods. Further applications, like the detection of changes of particle surface topology due to plasma-particle interaction or the decrease in particle size due to prolonged plasma exposure, are discussed as well.