Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 25: Poster: Electron scattering and recombination
A 25.9: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
A single particle detector for electron-ion collision experiments in the Cryogenic Storage Ring — •Kaija Spruck1, Claude Krantz2, Arno Becker2, Alfred Müller1, Oldřich Novotný3, Stephen Vogel2, Andreas Wolf2, and Stefan Schippers1 — 1Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Gießen — 2Max-Planck-Institut für Kernphysik, Heidelberg — 3Columbia Astrophysics Laboratory, New York, USA
The study of ion chemistry in the interstellar medium requires, among others, knowledge about cross sections for the recombination of atomic and molecular ions with low temperature (∼ 10 K) electrons. Especially the database on singly charged atomic ions relevant to the chemistry of molecular clouds is incomplete in this respect. The electrostatic Cryogenic Storage Ring (CSR), currently being commissioned at the Max-Planck-Institute for Nuclear Physics in Heidelberg, will allow experiments with atomic, molecular and cluster ions at beam energies up to 300 keV per unit charge in a cryogenic extremely high vacuum (XHV) environment. Collisions of stored atomic ions with electrons provided by an electron cooler will lead to reaction products with charge states that differ from those of the parent particles. The detection of these products will be carried out behind a bending deflector of the storage ring by a high-efficiency movable single-particle detector, based on a secondary electron converter backed by heatable microchannel plates. The designs of the mechanical actuator and the detector are compatible with the cryogenic operating conditions at 10 K and a bakeout temperature of up to 530 K.