Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Posters 3: Novelties in Molecular Physics: Theory of Molecular Dynamics, Collisions and Energy Transfer, and Experimental Techniques

MO 14.7: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

First experiments with the Cologne Chirped Pulse FTMW Spectrometer — •Marius Hermanns¹, Christian Endres², Alexey Potapov¹, and Stephan Schlemmer¹ — ¹I. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany — ²present address: Max Planck Institute for extraterrestrial Physics, Giessenbachstrasse 1, 85748 Garching, Germany

Detection of complex molecules in space strongly relies on the ability to reproduce and precisely measure their spectra in the laboratory [1, 2]. With the recent advancements in semiconductor development and the ability to have fast and high frequency amplifiers and detectors available the chirped pulse Fourier transform microwave techniques has been widely tested and established [3]. Having the ability to polarize a molecular ensemble and study its free induction decay and its collision behaviour within short measuring times promises to improve our understanding of molecular collisions in space.

Here we report and present our set-up of a chirped pulse Fourier transform microwave spectrometer. Utilizing a short waveguide molecular gas cell on a cold head we hope to be able to measure and characterize pure rotational transition data on many complex molecules in the frequency range of 2-26.5 GHz using a 5 GHz arbitrary waveform generator. Preliminary measurements on ammonia as a proof of concept were taken and are presented as a benchmark for sensitivity.

[1] A. Belloche et. al, A&A (2013).

[2] Müller, H. S. P.et. al, A&A (2001)

[3] Brown, G. G., Review of Scientific Instruments (2008)