Dresden 2011 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 9: Ion Trap and FT-ICR-MS, Molecules, Clusters and Reactions
MS 9.2: Vortrag
Freitag, 18. März 2011, 11:00–11:15, GÖR 229
Thermionic emission of highly excited cluster anions in a cryogenic electrostatic ion beam trap — •Sebastian Menk, Felix Berg, Klaus Blaum, Florian Fellenberger, Michael Froese, Michael Lange, Felix Laux, Robert von Hahn, and Andreas Wolf — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg
In the Cryogenic Trap for Fast ion beams (CTF), ions are trapped between two electrostatic mirror electrodes allowing the storage of up to 20 keV ion beams in a cold environment (4 K - 300 K) for long times (minutes). After achieving the development goals of the Cryogenic Storage Ring (CSR), namely improving the cryogenic design and verifying an extremely low residual gas density of 2000 cm−3, the CTF was moved to a new laboratory to make space for the CSR and for continued operation in molecular and cluster physics experiments.
Here, a new ion injection beam line has been taken into operation which includes a 90 ∘ dipole magnet for mass separation and an electrostatic quadrupole triplet for improved ion injection into the trap. In addition, a new 4 K helium supply line was installed, connecting the CTF again to the refrigeration system. A new MCP detection system equipped with a delay line anode has been placed inside the cryogenic vacuum chamber, providing enhanced solid angle detection and position sensitivity of the neutralized fragments.
We will report on room temperature thermionic emission measurements of Alx− (x=3-7) and SFn− (n=1-7) and include cold data down to 4 K from upcoming studies.