Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 19: Electronic Spectroscopy
MO 19.6: Vortrag
Donnerstag, 26. März 2015, 16:00–16:15, PH/HS1
Single Molecule Magnets investigated by gas phase X-ray Magnetic Circular Dichroism (XMCD) spectroscopy — •Matthias Tombers1, Joachim Hewer1, Jonathan Meyer1, Gereon Niedner-Schatteburg1, and Tobias Lau2 — 1Fachbereich Chemie & Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Berlin, Germany
We have recorded the first XMCD spectra of different isolated Single Molecule Magnets (SMMs) in the gas phase to deduce their intrinsic magnetic properties void of any surface or packing effects. We report the XMCD spectrum of the archetypal SMM Mn12-acetate on the Mn L3,2 absorption edges. Furthermore, we recorded the XMCD spectra of different [Fe4Ln2Lx]-type SMMs (Ln=Gd, Tb, Dy; L = different organic ligands) on the Fe L3,2- and the Ln M5,4- absorption edges respectively. The element selectivity of the XMCD technique allows us to determine the contribution of the different metals to the total magnetic moment of the molecules. Furthermore, sum rule analysis of the recorded XMCD spectra allows us to separate the total magnetic moment into its spin and orbital contribution. We have performed InfraRed Multi Photon Dissociation (IRMPD) spectroscopy of these molecules to address those magnetic moments to their structural features.