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MS: Fachverband Massenspektrometrie

MS 3: Präzisionsmassenspektrometrie, Ionenfallen, FT-IZR-MS, Moleküle, Cluster III

MS 3.2: Vortrag

Montag, 2. März 2009, 16:30–16:45, VMP 8 R05

Results from the commissioning of the double Penning trap system MLLTRAP[*] — •Veli Kolhinen, Eva Gartzke, Dietrich Habs, Jürgen Neumayr, Christian Schürmann, Jerzy Szerypo, and Peter Thirolf — Fakultät für Physik, LMU München and Maier-Leibnitz Laboratory, Am Coulombwall 1, 85748 Garching, Germany

A cylindrical double Penning trap [1] has been installed and successfully commissioned at the Maier-Leibnitz Laboratory (MLL) in Garching. This trap system has been designed to isobarically purify low energy ion beams and perform highly accurate mass measurements. Test measurements were performed by using an offline Rb surface ion source producing singly charged ⁸⁵Rb and ⁸⁷Rb ions. A mass resolving power of 139(2)· 10³ has been reached with the purification trap for ⁸⁵Rb ions and a relative mass uncertainty of the order of δ m/m=2.9· 10⁻⁸ with the measurement trap for ⁸⁵Rb ions by using ⁸⁷Rb as reference ions. This value does not yet include systematic uncertainties. Detailed studies of systematic uncertainties arising from magnetic field changes caused by short term temperature and pressure fluctuations in the experimental area and from the long term decay of the magnetic field strength have been performed and the result of the analysis will be presented. Mass measurements with offline actinide alpha recoil ion sources providing heavy radioactive species (e.g. ²⁴⁰U) are in preparation.

[*] Supported by DFG under contract HA 1101/14-1 and by Maier-Leibnitz-Laboratory, Garching.