Hamburg 2009 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Cluster

MO 14.6: Talk

Wednesday, March 4, 2009, 15:30–15:45, VMP 6 HS-F

Cluster Growth beyond Scaling Laws — •Wolfgang Christen and Klaus Rademann — Institut für Chemie, Humboldt-Universität zu Berlin, 12489 Berlin

The phenomenon of homogeneous nucleation is of fundamental relevance in fields such as atmospheric chemistry and materials science.

Continuing our earlier work on high-pressure jet expansions [1–3], we have studied the condensation of propane to small clusters in pulsed supersonic beams as a function of stagnation pressure and stagnation temperature, including the gaseous, liquid, and supercritical state, using mass-resolved time-of-flight analysis. While the well-known scaling law of cluster growth seems to be valid at lower pressures, unexpected and significant deviations are observed for pressures close to the phase boundary and for the supercritical state.
[1] Wolfgang Christen, Klaus Rademann, and Uzi Even, J. Chem. Phys. 125(17), 174307 (2006).

[2] Wolfgang Christen, Tim Krause, and Klaus Rademann, Rev. Sci. Instrum. 78(7), 073106 (2007).

[3] Wolfgang Christen and Klaus Rademann, Phys. Rev. A 77(1), 012702 (2008).