Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Poster I

A 8.13: Poster

Dienstag, 9. März 2010, 16:30–19:00, Lichthof

VUV photoionization spectroscopy of size selected silicon and aluminium cluster cations — •Christian Kasigkeit¹, Konstantin Hirsch¹, Andreas Langenberg², Jochen Rittmann², Marlene Vogel¹, Vicente Zamudio-Bayer¹, Jürgen Probst¹, Jörg Wittich¹, Thomas Möller¹, Bernd von Issendorf³, and Tobias Lau² — ¹Technische Universität Berlin, Institut für Optik und Atomare Physik, EW 3-1, Hardenbergstraße 36, D-10623 Berlin, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Institut für Methoden und Instrumentierung der Synchrotronstrahlung, Wilhelm-Conrad-Röntgen Campus / BESSY II, Albert-Einstein-Straße 15, D-12489 Berlin, Germany — ³Albert-Ludwigs-Universität Freiburg, Fakultät für Physik/FMF, Stefan-Meier-Straße 21, D-79104 Freiburg, Germany

Valence band photoionization spectroscopy of free size selected silicium and aluminium cluster cations has been performed in order to determine the lth (l=2 – 5) ionization potentials with respect to cluster size. Cluster size has therefore been varied from n = 6 up to n = 92 atoms for silicon and n = 7 to n = 56 for aluminium. The measured behavior of the ionization potentials corresponds to the liquid drop model. Charged clusters have been accumulated using a nitrogen cooled ion trap colinear to the exciting synchrotron radiation beam to obtain sufficient target density and absorption length. The spectra have been measured by detecting the ion yield of the resulting fragments.