Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 11: Posters 2: Novelties in Molecular Physics
MO 11.14: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Analysing destruction channels of interstellar hydrocarbon anions with a 22-pol ion trap — •Eric Endres1, Olga Lakhmanskaya1, Daniel Hauser1, Stefan Huber2, Thorsten Best1, Sunil Kumar3, Michael Probst1, and Roland Wester1 — 1Institute for Ion Physics and Applied Physics, University of Innsbruck, 6020 Innsbruck, Austria — 2now at: Department of Chemistry TU München, 85747 Garching, Germany — 3now at Max Planck Institut for Nuclear Physics, 69029 Heidelberg, Germany
Ion-molecule reactions are considered to play a key role in the formation of complex molecules in the interstellar medium. The recently detected interstellar carbon chain anions [1,2] are probably adding new pathways to create large molecules. To gain insight into the presence and influence of these interstellar anions, a detailed analysis of the possible destruction channels is indispensable. A cryogenic 22-pol radio frequency ion trap is a ideal tool to observe rare reactions at low temperature.
Here, we report on upper limits to the reaction rates for Cn− and CnH− (n= 2, 4, 6) with buffer gas temperatures of H2 at 12 and 300 K. The experimental results are discussed in light of quantum chemical simulation and implemented in a gas-phase astrochemical[3]. An outlook towards possible chain elongation reaction will be shown.
[1] M.C. McCarthy et al., Ap.J. (2006); [2] J. Cernicharo et al., A&A (2007); [3] E. Endres et al., J. Phys. Chem. A (2014)