Rostock 2019 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Precision Mass Spectrometry

MS 8.6: Vortrag

Donnerstag, 14. März 2019, 12:15–12:30, U A-Esch 2

Electron-ion merged beam experiments at the Cryogenic Storage Ring (CSR) — •Daniel Paul¹, Patrick Wilhelm¹, Oldřich Novotný¹, Sunny Saurabh¹, Ábel Kálosi^1,3, Klaus Blaum¹, Manfred Grieser¹, Robert von Hahn¹, Claude Krantz¹, Holger Kreckel¹, Daniel Zajfman², and Andreas Wolf¹ — ¹Max Planck Insitute for Nuclear Physics, Heidelberg, Germany — ²Weizmann Institute of Science, Rehovot, Israel — ³Visitor from Charles University of Prague, Czech Republic

Molecules up to water and organic species are produced in binary collisions in the cold interstellar medium (ISM), i.e. at ambient temperatures of ≈ 10−100 K. They influence the cooling of gas clouds and the formation of stars and planets. One of the key molecular reactions in the ISM is dissociative recombination (DR). Laboratory studies on DR are needed for understanding molecular evolution in space.

The cryogenic storage ring (CSR) provides a nearly perfect environment for DR studies at ISM-relevant conditions. With internal wall temperatures of 6 K most stored molecular ions radiatively cool to their rovibrational ground state. Moreover, a technically challenging, low-energy electron cooler was recently implemented into CSR that allows to perform electron-ion merged beam experiments in a cryogenic environment. Here we report on its electron cooling capabilities as well as on first rovibrational-state-selected DR rate coefficient measurements.