Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Novelties in Molecular Physics

MO 5.13: Poster

Monday, March 23, 2015, 17:00–19:00, C/Foyer

Cryo spectroscopy of size selected cobalt clusters — •Sebastian Dillinger, Jennifer Mohrbach, Maximilian Gaffga, Joachim Hewer, and Gereon Niedner-Schatteburg — Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

We have performed Infrared (Multiple) Photon Dissociation (IR(M)PD) spectroscopy of adsorbed nitrogen on size selected cobalt cluster cations (Co_n⁺, n = 8 - 17) at well-defined cryo temperatures. Our setup combines a hexapol ion trap for kinetic studies with a FT-ICR cell for IR(M)PD studies and mass analysis. Both ion traps are cryogenically cooled to temperatures below 30 K. The cold IR(M)PD spectra of the [Co_n(N₂)₁]⁺ clusters reveal well resolved bands. All complexes show single or multiple IR active bands within the range of 2180 to 2290 cm⁻¹ (2110 - 2350 cm⁻¹ probed). These bands are significantly red shifted with respect to the IR inactive stretching mode of free N₂ (at 2359 cm⁻¹). Preliminary ab initio DFT calculations augment the current experiments, failing to provide unambiguous structural conclusions as of now.