Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 39: Poster: Atomic clusters

A 39.8: Poster

Thursday, March 15, 2012, 16:30–19:00, Poster.V

Charging energies of medium-sized potassium clusters — •Jacob Chapman, Sebastian Illner, Holger Beh, Kiran Majer, Lei Ma, and Bernd von Issendorff — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg

We present measurements of the charging energies of medium-sized potassium clusters in the size range between 55 and 310 potassium atoms. A general size dependent trend of the charging energy can be drawn and correlated with a simple spherical droplet model. The results will be compared with charging energy measurements of sodium clusters.

The charging energy of a cluster can be determined by photoelectron spectroscopy (PES) with varying laser intensities. In oder to obtain the underlying data, PES of potassium clusters were recorded for a wide size range and at cluster temperatures of about 10K and 80K respectively.