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MS: Massenspektrometrie
MS 7: Fullerene: Eigenschaften und MS-Kalibration
MS 7.1: Talk
Thursday, March 16, 2006, 11:40–11:55, H1
Absolute Mass Measurements at SHIPTRAP by use of a Carbon-Cluster Ion Source — •Ankur Chaudhuri1,2 and the SHIPTRAP Collaboration2 — 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, D-17487, Germany — 2GSI, Planckstrasse 1, Darmstadt, D-64291, Germany
A carbon-cluster ion source has been installed and tested at SHIPTRAP, a Penning trap mass spectrometer for precision mass measurements of very heavy elements at GSI [1]. The cluster ions are produced by means of laser induced desorption, fragmentation and ionization of Sigradur®. A precision mass measurement is carried out by measuring the ion cyclotron frequency ωc = qB/m, where q/m is the charge to mass ratio of the ion and B is the magnetic field. The unknown mass of the ion of interest is obtained from the comparison of its cyclotron frequency ωc with that of a well known reference ion. Carbon clusters are the mass reference of choice since the unified atomic mass unit is defined as 1/12 of the mass of the 12C atom. Thus the masses of carbon clusters 12Cn, n=1,2,3,... are exact multiples of the unified atomic mass unit (the atomic binding energies can be neglected) and their use as reference ions has allowed first on-line absolute mass measurements at SHIPTRAP. In addition, cross reference mass measurements between carbon clusters of different size have been performed recently to investigate the accuracy of SHIPTRAP following an approach described in [2].
References
1. M. Block et al., Eur. Phys. J. A 25, S 01, 49-50 (2005)
2. A. Kellerbauer et al., Eur. Phys. J. D 22, 53-64 (2003)