Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 10: Posters 1: Cold Molecules, High Resolution Spectroscopy, and Theory
MO 10.21: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Foyer LLM
Cryo kinetics and IR spectroscopy of N2 and H2 adsorbed to size selected Rhodium and Tantalum clusters — •Matthias Klein, Annika Steiner, Amelie Ehrhard, Sebastian Dillinger, Jennifer Mohrbach, and Gereon Niedner-Schatteburg — Fachbereich Chemie and Forschungszentrum OPTIMAS, TU Kaiserslautern, Erwin-Schrödinger-Straße 52, 67663 Kaiserslautern
We recorded N2 adsorption kinetics and InfraRed-PhotoDissociation (IR-PD) spectra of the isolated cluster adsorbate complexes [Rh6(N2)m)]+, m=1-12. In conjunction with extensive DFT modelling, these measurements allow for assignments of the adsorbate arrangement at each adsorption step as well as possible reorganizations of the cluster core structure. By IR-PD spectroscopy combined with DFT modelling we observed a spin quenching with increasing N2 coverage as well as an adsorption induced relaxation of the cluster structures [1].
Currently, we investigate the N2 and H2 adsorption to small size selected Tan+, n=2-5 clusters. Recent studies on the tantalum dimer cation have analyzed the catalytic formation of ammonia from N2 and H2 [2]. Our current cryo IR-PD spectroscopy as well as cryo adsorption kinetics may provide for further spectroscopic and kinetic information about reaction precursors and intermediates.
[1] M. P. Klein, A. A. Ehrhard, S. Dillinger, J. Mohrbach, and G. Niedner-Schatteburg, Top. Catal. (2018), 61, 106-118. [2] C. Geng, J. Li, T. Weiske, H. Schwarz, PNAS (2018), 115, 11680-11687.