Hannover 2010 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Poster

MS 8.4: Poster

Donnerstag, 11. März 2010, 16:00–18:00, Lichthof

Ion cyclotron resonance detection techniques at TRIGA-TRAP — •K. Knuth1, T. Beyer2,3, K. Blaum2,3, M. Block4, K. Eberhardt1, M. Eibach1,3, F. Herfurth4, J. Ketelaer1, C. Smorra1,3, and Sz. Nagy2,41Johannes Gutenberg-Universität, 55128 Mainz — 2Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 3Ruprecht-Karls-Universität, 69120 Heidelberg — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt

In Penning trap mass spectrometry the mass of stored ions is obtained via a determination of the cyclotron frequency νc = q B/(2 π m), for which two different techniques are available. The destructive time-of-flight ion cyclotron resonance (TOF-ICR) technique, based on the measurement of the flight time of excited ions, is the established method for measurements on short-lived radionuclides. It is not ideally suited for rarely produced ion species, since typically some hundred ions are required for a single resonance spectrum. At the Penning trap mass spectrometer TRIGA-TRAP therefore a non-destructive narrow-band Fourier transform ion cyclotron resonance (FT-ICR) detection system is being developed. It is based on the detection of the image currents induced by the stored ions in the trap electrodes and will ultimately reach single ion sensitivity. TRIGA-TRAP also features broad-band FT-ICR detection for the coarse identification of the trap content. Additionally, the TOF-ICR detection system has been recently improved to utilize the Ramsey excitation technique to gain in precision, and the position information of the ion impact to further suppress background events in the final time-of-flight spectrum.

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