München 2004 – scientific programme
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MS: Massenspektrometrie
MS 7: Poster
MS 7.5: Poster
Thursday, March 25, 2004, 14:00–16:00, Schellingstr. 3
Spatially Resolved Ultra Trace Analysis of Elements using Laser Desorption and Resonance Enhanced Photoionisation — •Ilia Strachnov1, Klaus Eberhardt2, Gerhard Huber1, Sergej Karpuk1, Nikita Kotovski1, Jochen Maul1, Gerd Passler1, Maria Carmen Roca1, Norbert Trautmann2, and Klaus Wendt1 — 1Institut für Physik, Staudingerweg 7, — 2Institut für Kernchemie, Fritz-Strassmann-Weg 2, 55099 Mainz
A novel method for the spatially resolved ultra-sensitive and element-selective trace analysis is presented. The main concept is based on the combination of a commercial MALDI-TOF mass spectrometer, originally conceived for biomolecular analytics, with a pulsed tunable laser system for the resonant postionisation of neutrals. The analytical qualities are pointed out, such as the mass resolution, the overall detection efficiency, the element selectivity, the spatial resolution and the accuracy in the determination of isotopic ratios. Furthermore, a convenient way to perform an in situ mass calibration is explained.
In view of further applications, the methodical developments were done using the elements gadolinium (Z=64) and uranium (Z=92), closely connected to cosmochemical questions and to the environmental trace detection of actinide elements in the latter case.