Hamburg 2009 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 1: Präzisionsmassenspektrometrie, Ionenfallen, FT-IZR-MS, Moleküle, Cluster I
MS 1.4: Vortrag
Montag, 2. März 2009, 12:00–12:15, VMP 8 R05
Systematic studies at ISOLTRAP using the invariance theorem — •Christine Boehm1, Klaus Blaum2, Ch. Borgmann2, M. Breitenfeldt3, A. Herlert4, M. Kowalska4, D. Lunney5, S. Naimi5, Dennis Neidherr1, M. Rosenbusch3, and Lutz Schweikhard3 — 1Johannes Gutenberg University, Mainz, Germany — 2MPI for Nuclear Physics, Heidelberg, Germany — 3Ernst-Moritz-Arndt University, Greifswald, Germany — 4CERN, Geneva, Switzerland — 5University Paris-Sud 11, Orsay, France
ISOLTRAP is a Penning-trap mass spectrometer at the ISOLDE facility (CERN) where high-precision mass measurements on exotic nuclides are performed by determining their cyclotron frequency relative to that of a reference ion. For the obtained frequency ratios the present relative systematic uncertainty limit is δ m/m = 8·10−9 based on systematic studies using carbon cluster ions [1]. To further investigate the origin of the systematic uncertainty, and hopefully to decrease the magnitude, the invariance theorem by Brown and Gabrielse [2] was used. All three motional ion eigenfrequencies, as well as the conversion frequency were measured and compared. The difference Δ ωc between the conversion frequency and the cyclotron frequency calculated from the invariance theorem was found to be mass independent and about 240 mHz. The knowledge of Δ ωc in turn allows to estimate trap imperfections. The results of this study will be presented. [1] A. Kellerbauer et al., Eur. J. Phys. D 22, 53 (2003) [2] L. S. Brown, G. Gabrielse, Phys. Rev. A 25, 2423 (1982)