Hannover 2013 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 22: Biomolecules
MO 22.3: Vortrag
Donnerstag, 21. März 2013, 11:30–11:45, F 107
Microwave spectroscopy of trimethylgermanium iodide: Internal dynamics of a highly flexible molecule — •David Schmitz1, Alvin Shubert1, Thomas Betz1, Wolfgang Jäger2, and Melanie Schnell1 — 1Center for Free-Electron Laser Science, Hamburg, and Max-Planck-Institut für Kernphysik, Heidelberg — 2Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
The internal rotations of the three methyl groups of trimethylgermanium iodide ((CH3)3GeI) give rise to a complex splitting pattern in its microwave rotational spectrum. The understanding and correct interpretation of this pattern provides information not only about the internal motion, but also about the molecular structure, tunneling pathways, and the electron distribution within the molecule.
This contribution will present the interpretation of our measurements performed with three different microwave spectrometers with different spectral resolutions and covering different frequency regions.
A group-theoretical approach was used to make assignments to the spectra and understand the splitting pattern. Furthermore, ab initio calculations were performed in order to model the potential energy surface and investigate tunneling pathways. Finally, the results were compared with prior studies on trimethylgermanium chloride ((CH3)3GeCl) and trimethylgermanium bromide ((CH3)3GeBr).