Düsseldorf 2007 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 7: Poster

MS 7.4: Poster

Mittwoch, 21. März 2007, 16:30–18:30, Poster A

Electrospray Ionization Mass Spectrometry and Vacuum Deposition — •Stephan Rauschenbach, Nicha Thontasen, Nicola Malinowski, and Klaus Kern — Max-Planck-Institut for Solid State Research, Nanoscale Science Department, Heisenbergstr. 1, 70569 Stuttgart

Scanning Tunneling microscopy offers an atomic scale view of functional molecules and nanostructures at surfaces. In case of large biological molecules or inorganic nanoparticles, their controlled deposition on well defined surfaces under ultra-high vacuum conditions is hindered by their low vapor pressure.

Electrospray Ionization (ESI) is widely used as ionization technique for mass spectrometric applications in biology and organic chemistry, because of the unique destruction free ionization of even large biological molecules from solution. Here it is used to create an ion beam for soft landing vacuum deposition. The ion beam is guided by RF- and electrostatic ion optics through several pumping stages into ultrahigh vacuum.

Using time-of-flight mass spectrometry the composition of the beam can be characterized before deposition. The deposition of clusters, large molecules and proteins was demonstrated for high vacuum conditions. Current studies are focusing on the destruction free deposition of molecules and clusters, so called soft landing.

S. Rauschenbach, F. Stadler, E. Lunedei, N. Malinowski, S. Koltsov, G. Costantini, K. Kern, Electrospray Ion Beam Depostion of Clusters and Biomolecules, Small 4 (2006)