Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 4: Atomic Clusters II
A 4.4: Vortrag
Montag, 19. März 2007, 15:00–15:15, 6G
Optical properties of isomer resolved diamond clusters — •Lasse Landt1, Christoph Bostedt1, Kathrin Klünder1, Thomas Möller1, Jeremy Dahl2, SG Liu2, and Robert Carlson2 — 1Technische Universität Berlin, Germany — 2MolecularDiamond Technologies, Richmond, CA, U.S.A.
The optical absorption of perfectly size- and structure-selected, neutral, and surface-passivated diamond clusters, so-called diamondoids, was measured in the gas phase with synchrotron radiation at beamline I of Hasylab at DESY. For this purpose a novel absorption cell for gas phase measurements in the vacuum ultraviolet spectral regime was developed. Optical absorption spectra in the energy range of 5-10 eV were recorded for nine different diamondoids, ranging in size from 10 to 26 carbon atoms, among them several isomeric structures. Our results reveal that the absorption of these subnanometer group IV semiconductor clusters depends on both size and shape. The observed isomeric dependencies will be discussed in terms of the electronic structure of the diamond clusters and compared to recent theoretical predictions.