SAMOP 2021 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 1: Electronic
MO 1.5: Vortrag
Montag, 20. September 2021, 12:00–12:15, H2
X-ray L-edge absorption spectroscopy on gas phase diatomic iron halide systems beyond the oxidation state — •Max Flach1,2, Vicente Zamudio-Bayer1, Konstantin Hirsch1, Martin Timm1, Olesya Ablyasova1,2, Mayara da Silva Santos da Silva Santos1,2, Markus Kubin Kubin1, Christine Bülow2, Bernd von Issendorff2, and Tobias Lau1,2 — 1Helmholtz-Zentrum, Berlin, Germany — 2Albert-Ludwigs-Universität, Freiburg, Germany
Transition Metal L-edge spectroscopy is widely used to determine oxidation states of a wide range of samples, hence, an estimate of uncertainty contributions to assigned oxidation states from chemical shifts is of high importance. Here we use gas phase FeX+ (X=F, Cl, Br, I) as a idealized model system to provide high resolution XAS spectra to quantify energy shifts of the Iron L3-edge and to study changes in electronic structure within the same oxidation state of Fe(II). Along with a change in line shape of the Iron L3-edge, we observe energy shifts of the intensity distributions median of the spectra along the series. The observed shifts hint towards a charge transfer to and from the halogen to the iron, involving orbitals of different symmetry.