Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 5: Posters 1: Novelties in Molecular Physics
MO 5.17: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
A High Resolution Microwave Spectrometer to Study Large Chiral Molecules — •Chris Medcraft1,2, Robert Wolf3, and Melanie Schnell1,2 — 1Max-Planck-Institut für Struktur und Dynamik der Materie, Hamburg, Germany — 2Center for Free-Electron Laser Science, Hamburg, Germany — 3Universität Regensburg, Institut für Anorganische Chemie, Regensburg, Germany
A high-resolution, cavity-based Fourier-transform microwave spectrometer is being commissioned in Hamburg. The spectrometer is based around the COBRA design (Coaxially Oriented Beam-Resonator Arrangement[1]). The higher resolution (ca. 3 kHz) and larger spectral range (6-40 GHz) of this instrument will complement our broadband chirped-pulse FTMW spectrometer[2] (2-8.5 GHz), allowing for investigations of nuclear quadrupole hyperfine structure and internal rotation. When combined with a source of cold, slow molecules,[3] transit-time and Doppler broadening is reduced and the enhanced resolution may be able to discriminate the parity violating effects in large chiral molecules such as CpRe(NO)(CO)I (Cp=cyclopentadienyl). The rotational spectrum of the related molecule CpRe(CH3)(CO)(NO) has been measured using the chirped-pulse FTMW spectrometer showing that the analysis of such large and complicated molecules is feasible.[4]
[1]Grabow, Rev. Sci. Instrum., 67, 4072 (1996)
[2]Schmitz, Shubert, Betz, Schnell, J. Mol. Spec 280 (2012) 77
[3]Merz, Vanhaecke, Jäger, Schnell, Meijer, Phys. Rev. A 85, (2012) 063411
[4]Medcraft, Wolf, Schnell Angew. Chem. Int. Ed. 53 (2014) 11656