Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 5: Clusters I (with A)

MO 5.1: Invited Talk

Tuesday, March 7, 2017, 11:00–11:30, N 6

Cryo Kinetics and Spectroscopy of 3d Metal Clusters and Alloys — Jennifer Mohrbach, Sebastian Dillinger, Matthias Klein, Amelie Ehrhard, and •Gereon Niedner-Schatteburg — Fachbereich Chemie, TU Kaiserslautern

The cluster surface analogy motivates us to utilize our hybrid tandem ion trap instrument (cryo-RF-hexapole and cryo-FT-ICR trap) for the study of adsorption and reaction kinetics of clusters under single collision conditions at 11 -30 K, and for IR Photon Dissociation (IR-PD) spectroscopy initially focusing on the one and two colour investigations of metal organic complexes^[1] and lately extended towards their N₂ adsorption properties^[2].

We have started a systematic study of N₂ and H₂ cryo adsorption on size selected Fe, Co, and Ni clusters, and their alloys^[3]. Adsorption kinetics show mono layer like adsorbate shells. IR-PD spectra of cluster adsorbate complexes [M_n(N₂)_m]⁺ reveal complex patterns - DFT modelling providing some support. There are adsorbate coverage dependent spectral shifts and splittings that report on the cluster and adsorbate geometries. We compare to our synchrotron X-ray based studies of spin and orbital contributions to the total magnetic moments of the clusters^[4]. Supported by SFB 3MET.de.

[1] Y. Nosenko et al. PCCP 15, 8171 (2013); J. Lang et al. PCCP 16, 17417 (2014). [2] J. Lang et al., Chem.Comm 2016 (in print). [3] S. Dillinger et al. PCCP 17, 10358 (2015); J. Mohrbach et al. JPC A 2016 (submitted). [4] S. Peredkov et al. PRL 107, 233401 (2011); J. Meyer et al. JCP 143, 104302 (2015)