Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.65: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Setup and characterisation of CRD and SHG spectrometer for measuring optical response of supported metal clusters and evaporated molecules under UHV conditions — •Tobias Lünskens, Philipp Heister, Martin Tschurl und Uli Heiz — Technische Universität München, Lehrstuhl für physikalische Chemie

Supported metal clusters have attracted considerable interest due to their special catalytic properties. Optical and catalytic properties of these metal clusters are determined by their electronic structure which can be studied by optical absorption spectroscopy as well as surface second harmonic generation (s-SHG) spectroscopy under UHV conditions. The interest mainly focuses on the size and shape dependent electronic structure of deposited cluster. Due to their low absorption cross-section and the low surface coverage that is necessary to avoid agglomeration of the clusters highly sensitive techniques such as surface cavity ring-down (s-CRD) spectroscopy and s-SHG-spectroscopy are needed. By s-CRD-spectroscopy we also investigate evaporated molecules and their interaction with different substrates und size selected metal clusters. We present the experimental setup which is composed of two main parts: A cluster deposition unit including laser vaporization cluster source, ion optics, and mass selection device and three different spectroscopic methods, including s-CRD spectroscopy in the UV-Vis- (from 400 nm to 900 nm) and in the IR-region (from 2500 nm to 3500 nm), and s-SHG-spectroscopy for measurements down to 200 nm. A transfer chamber allows fast change of support materials without breaking UHV.