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Invitation to a talk by Philipp C. Schmid

07.01.2020

Probing cold molecules in the gas-phase - one at a time

Philipp C. Schmid

JILA and Department of Physics, University of Colorado, Boulder, CO 80309, USA

1. Physikalische Institut, Universität zu Köln, Zülpicher Strasse 77, Cologne, Germany

 

Wednesday, January 8 , 2019, 14:15

Seminarroom 3354A, 3rd floor, Boltzmanngasse 5, 1090 Vienna

Hosted by: Oliver Heckl

Complex neutral molecules and their ions are omnipresent in the interstellar medium. Thereby bi- molecular reactions between ions and neutrals form the basis for the chemical network in the interstellar medium. To advance the understanding of the underlying fundamental physical and chemical processes dedicated molecular reaction experiments as well as high-resolution spectroscopy measurements are required.

Unfortunately, experimental measurements of molecular ion-neutral interactions at cold temperatures are very challenging and thus very rare. We use tools borrowed from the cold atom community to measure such reactions under cold and well-controlled conditions [1]. Here we can study reactions between atoms and molecules in single-quantum states [2,3]. Additionally, the high sensitivity of the apparatus allows to study reactions with reaction rates as low as one reaction per minute. I will present the capabilities of this cold ion-molecule reaction apparatus and present recent results on the isomer resolved reaction between C2H2+ and the two isomers of C3H4 - propyne and allene.

Apart from reaction data high-resolution infrared and rotational spectra of molecules are required for a more thorough description of the chemical network of the interstellar medium and to support the interpretation of astronomical observations. But such information are largely missing in literature. To fill this gap, dedicated laboratory spectroscopy of trapped cations in a cryogenic environment are performed [4]. I will report on recent measurements regarding the rotational spectra of small charged hydrocarbons.