Hannover 2016 – scientific programme

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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 14.21: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

Polarization Rotation IMPACT-FT-MW Spectrometer — •Dennis Wachsmuth and Jens-Uwe Grabow — Institut für Physikalische Chemie, Leibniz Universität Hannover, Callinstr. 3A, Hannover, Deutschland

As has been previously shown, the in-phase/quadrature phase modulation passage-acquired coherence technique(IMPACT) Fourier-transform microwave (FT-MW) spectrometer delivers broadband capabilities at highest spectral resolution.
Nevertheless due to specific details in the electronic setup the applicable maximum polarization power was limited. Hence less polar molecules were difficult to measure.
In a novel approach this disadvantage could be circumvented by use of the polarization direction of the microwave radiation. The setup prevails the high spectral resolution but increases the sensitivity dramatically while allowing the utilisation of very high power tube amplifiers.
In this contribution we present the novel apparatus in detail as well as experimental results obtained with the modified spectrometer.