Hannover 2003 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MS: Massenspektrometrie

MS V: HV V

MS V.1: Hauptvortrag

Donnerstag, 27. März 2003, 11:30–12:00, F 428

Interaction of electrons and molecules with a single trapped nanoparticle — •Stephan Schlemmer, Stefan Wellert, Falk Windisch, Michael Grimm, Silko Barth, and Dieter Gerlich — Faculty of Natural Science, University of Technology, 09107 Chemnitz, Germany

High-resolution and non-destructive nanoparticle mass spectrometry (NPMS) is used to study the interaction of electrons and molecules with the surface of a single, isolated particle stored in a three-dimensional quadrupole trap over weeks. IR-laser heating is employed as a fast temperature control. The kinetics of adsorption and desorption of molecules is studied for a 500 nm in diameter SiO₂ particle. A C₆0 multilayer film has been prepared during online NPMS monitoring. Emission probabilities for secondary electrons, δ, are determined for a bare particle and the particle with a 40 nm thick layer of C₆0. From the molecular desorption rates (  fg/h) at constant temperature binding energies of multilayer 1.47 eV and submonolayer 1.53 eV C₆0 have been determined. Future perspectives of this combined mass spectrometry and surface science technique are discussed.