München 2004 – wissenschaftliches Programm
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MS: Massenspektrometrie
MS 6: Hochaufgelöste und genaue Massenspektrometrie
MS 6.1: Vortrag
Dienstag, 23. März 2004, 17:00–17:15, HS 112
Carbon clusters as absolute mass references for Penning trap mass measurements on radionuclides — •Manas Mukherjee1, K. Blaum2, M. Block1, F. Herfurth2, A. Kellerbauer2, H.-J. Kluge1, W. Quint1, S. Rahaman1, C. Rauth1, D. Rodríguez1, G. Sikler1, M. Suhonen1, and C. Weber1 — 1Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany — 2CERN, 1211 Geneva 23, Switzerland
Penning trap mass spectrometry on radionuclides is based on the measurement of the cyclotron frequency of a charged particle in a strong homogeneous magnetic field. The calibration of the magnetic field strength has to be performed via a cyclotron frequency measurement on a well-known reference mass, both before and after measurement of the cyclotron frequency for the ion of interest. Such well-known masses are rare, especially in the heavy and super-heavy mass region of the nuclear chart, where SHIPTRAP at GSI aims for high-precision mass measurements. Here, carbon clusters provide the reference ions of choice, as demonstrated with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN: A multitude of reference masses is available which are at most six mass units away from the radionuclide of interest. In addition, one can perform absolute mass measurements since the measurement is directly related to the microscopic mass standard. For this purpose a versatile laser desorption carbon cluster ion source has been designed, constructed and tested. The setup as well as first results will be presented and discussed.