Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 16: Atomic Clusters II
A 16.3: Vortrag
Mittwoch, 4. März 2009, 15:00–15:15, VMP 6 HS-B
Electronic and magnetic properties of size selected scandium and manganese doped silicon cluster cations — •Robert Richter1, Konstantin Hirsch1, Philipp Klar1, Andreas Langenberg1, Fabian Lofink1, Jürgen Probst1, Jochen Rittmann1, Marlene Vogel1, Vicente Zamudio-Bayer1, Thomas Möller1, Bernd von Issendorff2, and Tobias Lau1 — 1Technische Universität Berlin, Institut für Optik und Atomare Physik EW 3-1, Hardenbergstrasse 36, D-10623 Berlin — 2Albert-Ludwigs-Universität Freiburg, Fakultät für Physik/FMF, Stefan-Meier-Strasse 21, D-79104 Freiburg
Because of its high abundance in mass spectra and backed by theoretical predictions, VSi16+ is assumed to be a magic transition metal doped silicon cluster with high symmetry and electronic shell closure. Core level spectroscopy on size-selected clusters in an ion trap recently revealed that TiSi16+, VSi16+, and CrSi16+ are indeed highly symmetric cage clusters which can be described in the spherical potential model. Extending our studies to ScSi16+ and MnSi16+, we show that this simple description is no longer valid if the cage geometry and the number of valence electrons deviate strongly from the ideal situation in VSi16+. Instead, the Mn 2p X-ray absorption spectrum indicates that MnSi14+ is a symmetric cluster with a local d5 configuration of the Mn atom, pointing at a high spin state. This is the first experimental evidence of a high magnetic moment in transition metal doped semiconductors clusters. We will discuss these results together with electronic properties and reactivities of ScSin+ and MnSin+ clusters.