Regensburg 2007 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 6: Heterogene Prozesse in der Atmosphäre - gemeinsam mit dem Arbeitskreis Athmosphärenchemie (AKAC) der GDCh
UP 6.3: Vortrag
Montag, 26. März 2007, 14:45–15:00, H48
Development and Characterization of an Ion Trap Mass Spectrometer for Atmospheric Aerosol Particles — •Andreas Kürten1, Joachim Curtius2, and Stephan Borrmann1,2 — 1Max-Planck-Institut für Chemie, Abteilung Partikelchemie, Becherweg 27, 55128 Mainz — 2Johannes Gutenberg-Universität, Institut für Physik der Atmosphäre, Becherweg 21, 55099 Mainz
A novel Aerosol Ion Trap Mass Spectrometer (AIMS) has been set-up and characterized. With the AIMS the chemical composition of the non-refractory component of atmospheric aerosol particles can be measured quantitatively. The instrument makes use of the well-characterized aerosol inlet and evaporation/ionization system of the Aerodyne Aerosol Mass Spectrometer (AMS) and utilizes a 3-dimensional quadrupole ion trap as the mass analyzer. This has the advantage that MSn-experiments can be carried out for ion structure determination. For laboratory-generated polystyrene latex particles it has been demonstrated that MS/MS-studies can be carried out with a daughter/parent ion yield of > 60%. Furthermore, it has been found that the mass resolving power reaches values > 1500 for m/z 43 which is high enough to allow the differentiation between C2H3O+ and C3H7+. Calibrations with laboratory-generated aerosol particles indicate a perfectly relationship between signal response and aerosol mass concentrations. The detection limits for particulate nitrate and sulphate show that with the AIMS atmospheric measurements can be performed which is supported by an inter-comparison between the AIMS and a Quadrupole-AMS for urban air.