Berlin 2014 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 6: Poster

MS 6.10: Poster

Mittwoch, 19. März 2014, 14:00–14:00, DO24 Foyer

Analysing Destruction Channels of interstellar Hydrocarbon Anions with a 22pol Ion-Trap — •Eric Endres, Olga Lakhmanskaya, Thorsten Best, Daniel Hauser, Sunil Kumar, and Roland Wester — Universität Innsbruck, Institut für Ionenphysik und Angewandte Physik, Österreich

In the interstellar medium (ISM), ion-molecule reactions are considered to play a key role in the formation of complex molecules. The detection of the first interstellar anions [1,2], which happen to be carbon chain anions, has raised new interest in the quantitative composition of the ISM and the underlying reaction network. To understand the observed abundance of these carbon chain anions, a detailed analysis of the possible destruction channels is indispensable.

A cryogenic 22-pol radio frequency ion trap is an ideal tool to observe reactions that take place slowly, such as carbon chain anions with molecular hydrogen [3]. Furthermore, measurements over a large temperature scale are feasible. Longitudinal optical access to the trap also provides the possibility to make precise photodetachment measurements.[4]

Temperature dependent measurements of the reaction rates for the reaction between hydrocarbon chain anions and H₂ will be presented.
[1] McCarthy et al. Ap.J. 652:L141 (2006); [2] Cernicharo et al. A&A 467, p. L37-L40; [3] Eichelberger et al. Ap.J. 667:1283 (2007); [4] Best et al. Ap.J. 742:63 (2011)