Mainz 2017 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 12: Posters 2: Molecular Dynamics, Clusters, and High Resolution Spectroscopy
MO 12.17: Poster
Mittwoch, 8. März 2017, 17:00–19:00, P OG1
High-resolution spectroscopy on the hyperfine structure of small aluminum-bearing molecules and analysis of their resulting electronic structures — •Björn Waßmuth1, Alexander Breier1, Guido W. Fuchs1, Thomas F. Giesen1, and Jürgen Gauss2 — 1Institute of Physics, University of Kassel, 34132 Kassel, Germany — 2Institute of Physical Chemistry, University of Mainz, 55099 Mainz, Germany
We investigate metal-containing small molecules in the gas phase by means of millimeter/submillimeter-wave spectroscopy. The experimental investigation is guided by high-level quantum chemical calculations performed at Mainz.
Al16O, Al32S, and Al34S are produced by laser ablation of solid aluminum and a dilution of N2O (2%) or H2S (7%) in helium buffer gas, that subsequently undergoes an adiabatic expansion in our vacuum chamber. The resulting molecular beam is probed by monochromatic radiation in the frequency range up to 400 GHz. Measurements reveal the hyperfine structure of these linear molecules to follow Hund’s case bβ S coupling due to the nuclear spin of aluminum.
From the rotational constants the bond lenghts are obtained. Analysis of our data including the hyperfine parameters of AlX (with X∈ {F, Cl, Br, I}) reveals details of the respective electronic structures. With the present work new molecular parameters for future mesurements on AlY (with Y∈ {N, P}) are predicted.