Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 2: Clusters

MO 2.7: Talk

Monday, March 17, 2014, 12:00–12:15, BEBEL SR144

Optical Properties of Supported Size Selected Ag Clusters in the Small Size Limit studied by SHG spectroscopy — Philipp Heister, •Tobias Lünskens, Aras Kartouzian, Martin Tschurl, and Ueli Heiz — Chair of Physical Chemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany

The optical properties of noble metal nanoparticles have received considerable interest in the past decades due to their Localized Surface Plasmon Resonance (LSPR). These collective oscillations of conduction band electrons can be described classicaly by extensions of Mie theory for particle diameters down to 2 nm. For particles consisting of only a few atoms, this classical description does not hold true anymore. Only a few experimental investigations of this small size limit are reported so far. In those studies the optical properties of metal clusters in the gas phase and metal clusters embedded in rare gas matrices were investigated.

We present Second Harmonic Generation spectra of mono-dispersed silver clusters (Agn, n<55). These clusters were generated by a laser vaporization source, size selected by a Q-MS and soft-landed onto a SiO2 target. Spectra of individual sizes were recorded under UHV conditions. The spectra reveal a clear size dependency, which is discussed by comparison with literature.