Hannover 2010 – scientific programme
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MO: Fachverband Molekülphysik
MO 18: Cluster I
MO 18.6: Talk
Thursday, March 11, 2010, 11:45–12:00, F 102
Cluster-induced desorption as a versatile tool for surface and interface characterization — B.-J. Lee1, C.R. Gebhardt2, H. Schröder3, K.L. Kompa3, and •M. Dürr1 — 1Fakultät Angewandte Naturwissenschaften, Hochschule Esslingen, Esslingen — 2Bruker Daltonik GmbH, Bremen — 3Max-Planck-Institut für Quantenoptik, Garching
Cluster-induced desorption using neutral molecular SO2 clusters was employed for the investigation of alkali halides adsorbed on metals and insulators. The influence of substrate and adsorbate configuration, especially of the hydration of the respective ions on the surface, was studied. As long as the anions are efficiently screened by a hydration shell, they are effectively desorbed by means of cluster impact. To higher surface temperatures, the hydration shell is lost and a strong adsorbate-surface bond prevents efficient desorption of the anions. Cations are seen to be desorbed from metals via a neutral desorption channel with subsequent charge separation in the cluster whereas only a positive signal is observed for desorption from insulators. The experiments demonstrate the possibility of cluster-induced desorption to monitor surface configurations which are not accessible by means of conventional heating, similar to the case of cluster-induced fragmentation-free desorption of biomolecules [1].
[1] Gebhardt et al., Angew. Chem. Int. Ed. 48, 4162 (2009).