Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 13: Clusters II (joint session MO/A)

A 13.7: Talk

Tuesday, March 10, 2020, 15:30–15:45, f142

Rayleigh scattering of a pulsed supersonic jet of Ar and CO₂ at high particle densities — •Sara Fazli and Wolfgang Christen — Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Straße 2, 12489 Berlin

We present an experimental setup for the investigation of Rayleigh scattering of a pulsed supersonic jet and present first results for the scattered light intensity as a function of cluster source conditions. A jet of pure Ar or CO₂, respectively, is expanded through a parabolic nozzle at source temperatures between 230 K and 410 K and source pressures between 2 MPa and 10 MPa. The change of the Rayleigh scattering signal with source pressure and temperature is compared with the prediction of Hagena’s scaling law (J. Chem. Phys. 56, 1793, 1972). Results show a pronounced dependence of the scaling parameters on the aggregation state (gas versus liquid) of the expanding fluid.