25 April 2008 Detection of security relevant substances within the cooperative project SAFE XUV
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Abstract
The objective of this project funded by the German BMBF was to show that security relevant substances can be detected in complex matrices at low concentrations using single photon ionization ion trap mass spectrometry (SPI-ITMS). The advantage of such a soft ionization technique is a reduction of unwanted fragment ions in mass spectra allowing identification of signals from complex matrices and enabling MS/MS capability. The MS/MS studies permit low false-positive and false-negative rates. Additionally, the accumulation of the ions in the ion trap decreases the detection limit. To obtain low detection limits the ionization potentials (IPs) of the relevant substances have to be below the IPs of the bulk matrix components. That enables the utilization of a photon energy unaffecting the matrix components resulting in increased sensitivity due to essentially non-existent background signals. As literature values for many ionization potentials are unavailable, IPs of several security relevant substances were determined using monochromatized synchrotron radiation from BESSY, Germany. All analyzed substances exhibited IPs significantly below the IPs of common matrix molecules such as water, nitrogen and oxygen. First measurements with a pre-demonstrator show that it is possible to shield matrix substances using a well chosen photon energy for soft ionization.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Elisabeth Schramm, Elisabeth Schramm, Stephan Borrmann, Stephan Borrmann, Joachim Curtius, Joachim Curtius, Andreas Goertler, Andreas Goertler, Thomas Heindl, Thomas Heindl, Andreas Kuerten, Andreas Kuerten, Alexander McNeish, Alexander McNeish, Stefan Mitschke, Stefan Mitschke, Andrei Morozov, Andrei Morozov, Fabian Muehlberger, Fabian Muehlberger, Michael Puetz, Michael Puetz, Gerd Reichardt, Gerd Reichardt, Hermann Ries, Hermann Ries, Patricia Schall, Patricia Schall, Rasmus Schulte-Ladbeck, Rasmus Schulte-Ladbeck, Rainer Schultze, Rainer Schultze, Martin Sklorz, Martin Sklorz, Roman Trebbe, Roman Trebbe, Andreas Ulrich, Andreas Ulrich, Jochen Wieser, Jochen Wieser, Ralf Zimmermann, Ralf Zimmermann, } "Detection of security relevant substances within the cooperative project SAFE XUV", Proc. SPIE 6945, Optics and Photonics in Global Homeland Security IV, 69451H (25 April 2008); doi: 10.1117/12.786209; https://doi.org/10.1117/12.786209
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