Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 101: Particles and clusters II

O 101.7: Vortrag

Freitag, 18. März 2011, 12:45–13:00, WIL C107

Linear and nonlinear optical properties of supported metal clusters and adsorbed molecules — •Philipp Heister, Martin Thämer, Aras Kartouzian, and Ueli Heiz — Lehrstuhl für Physikalische Chemie, Technische Universität München

Metal clusters in the non-scalable size regime supported on oxide surfaces have unknown optical properties, which are essential for the understanding of photochemical properties of cluster-assembled materials and their use in optical applications. Cavity ring-down spectroscopy (CRDS) and surface second harmonic generation spectroscopy (S-SHGS) have been applied to samples of various metal clusters, in order to investigate their optical properties in the wavelength range from 215 to 700 nm. The performance of the employed experimental apparatus is characterized by measuring organic laser dye molecules adsorbed on surfaces as a model system.

We show that both these highly sensitive spectroscopic methods are applicable and are of complementary nature. CRDS for supported samples is limited to wavelengths above 400 nm. S-SHGS is readily extended into the far UV up to 215 nm but for the interpretation of the results the linear spectra obtained by CRDS are needed.