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Hannover 2010 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 33: Cluster II

MO 33.4: Vortrag

Freitag, 12. März 2010, 14:45–15:00, F 102

Inner-shell excitation of size-selected 10 nm silicon oxide nanoparticles in an aerodynamically focused particle beam — •Egill Antonsson1, Burkhard Langer1, Jan Meinen2,3, Svetlana Khasminskaya3, Markus Eritt3, Thomas Leisner2,3 und Eckart Rühl11Physical and Theoretical Chemistry, Insitute for Chemie and Biochemistry, Freie Univerität Berlin, Germany — 2Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Germany — 3Institute for Environmental Physics, Reprecht-Karls-Universität Heidelberg, Germany

We present results from an experiment in which silicon oxide nanoparticles (d: ≈ 10 nm) were studied in the gas phase in a particle beam by photoelectron spectroscopy. The particles were produced in situ in a plasma discharge reactor and aerodynamically focused. Pulsed injection into the interaction area allowed us to study nanoparticles with soft x-rays in a size regime in which it has proven notoriously difficult to attain sufficient target densities. The photo-emission of the nano particles was recorded after excitation near the Si 2p absorption edge using synchrotron radiation. Photon energies between 100 eV and 150 eV were used. The binding energy of Si 2p3/2 was determined to be 110.2 ± 0.2 eV relative to the vacuum level. The binding energy of Si 2p3/2 in bulk SiO2 has been reported to be 103.8 eV relative to the Fermi level [1] which lies 5.1 eV below the vacuum level [2]. The higher binding energy in the nanoparticles will be discussed.
D. G. J. Sutherland et. al, Phys. Rev. B, 48, 14989-15001 (1993)
F.J. Himpsel et al., Phys. Rev. B, 38, 6084-6096 (1998)

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