Erlangen 2018 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 4: New Developments
MS 4.1: Hauptvortrag
Dienstag, 6. März 2018, 14:00–14:30, R 1.020
First molecular beam cooled to its lowest quantum states at the Heidelberg Cryogenic Storage Ring — •Christian Meyer1, Arno Becker1, Klaus Blaum1, Christian Breitenfeldt1,2, Sebastian George1, Jürgen Göck1, Manfred Grieser1, Florian Grussie1, Claude Krantz1, Holger Kreckel1, Preeti M. Mishra1, Oldřich Novotný1, Felix Nuesslein1, Aodh P. O’Connor1, Roland Repnow1, Sunny Saurabh1, Stefan Schippers3, Lutz Schweikhard2, Kaija Spruck1,3, Stephen Vogel1, Robert von Hahn1, Patrick Wilhelm1, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany — 3Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
The Heidelberg Cryogenic Storage Ring (CSR) [1] is a fully cryogenic, electrostatic ring with a circumference of 35 m. By cooling the experimental chambers down to 6 K, a residual gas density below 140 cm−3 can be reached. Thus ion beams can be stored up to several hours. Under such conditions infrared-active molecules can radiatively cool down to their rovibrational ground state. The excitation of OH− was probed in a 60 keV ion beam by near-threshold photodetachment revealing radiative lifetimes of the lowest rotational states (∼190 s for J=1) and an effective molecular temperature of 15 K [2]. Hence we are ready to study molecular ions in collisions with neutral atoms, electrons and photons under truely interstellar conditions. The experimental approach and results will be discussed.
[1] R. von Hahn et al., Rev. Sci. Instrum. 87, 063115 (2016)
C. Meyer et al., Phys. Rev. Lett. 119, 023202 (2017)