Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 10: Posters 1: Cold Molecules, High Resolution Spectroscopy, and Theory
MO 10.22: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Foyer LLM
Strong temperature and size effects in iron-nitrogen interactions — •Annika Steiner1, Matthias P. Klein1, Sebastian Dillinger1, Jennifer Mohrbach1, Peter B. Armentrout2, and Gereon Niedner-Schatteburg1 — 1Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
It is a pending challenge to characterize the interaction of N2 with transition metal surfaces and clusters in detail. For our experiments, we utilized a modified Fourier Transform Ion Cyclotron Resonance Mass Spectrometer (FT-ICR MS). With our tandem cryo trap instrument we investigate N2 adsorption on Co, Ni, and Rh as well as N2 and H2 co-adsorption on Ru8+.
Currently, we investigate Fen+ clusters for reductive nitrogen activation and we conduct temperature dependent studies of N2 adsorption. We found size and pressure dependent effects, such as extremely slow N2 adsorption on Fe17+. Also, we identified two isomers for the Fe18+ cluster one of which is unreactive.
Futhermore, we present gas phase IR spectra of N2 adsorption on isolated cationic Fen+ clusters at cryo temperatures. We find cluster size dependent and adsorbate number dependent effects in the IR spectra. All complexes show single or multiple IR active bands. These bands are significantly red shifted with respect to the IR inactive stretching mode of free N2 (2359 cm−1).