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MS: Massenspektrometrie
MS 4: Laser Mass Spectrometry of Molecules and Aerosols
MS 4.2: Vortrag
Dienstag, 3. April 2001, 17:30–17:45, EB 202
Broad Bandwidth Laser Ionization Mass Spectrometry as Powerful Tool for Trace Gas Analysis — •Ruben Garnica1, Wytze Van der Veer2, Matt Appel2, Ryan McKeachie2, Luke Short2, and Thorsten Benter2 — 1Institut für Physikalische und Theoretische Chemie, Technische Universität München, 85747 Garching. Tel: 089/289-13601. Fax: 089/289-14430 — 2University of California, Irvine, Irvine CA 92697-2025. Fax: (949) 824 3168. Email: tbenter@uci.edu
The atmospheric oxides of nitrogen NO and NO2 (NOx) are known to play major roles in both the remote and urban environments. NOx has been shown to affect, e.g., the production rate of tropospheric ozone, the oxidation pathways of hydrocarbons, and the production of organic and inorganic aerosols. Due to the dynamic nature of the atmosphere with respect to chemical composition, in-situ analysis remains paramount in understanding the complex nature of this environment. Such atmospheric measurements require analytical tools, which are mobile and have selective, in-situ ultra-trace detection capability.
For this purpose an instrument combining time-of-flight mass spectrometry with broad bandwidth laser ionization has been developed and applied for the measurement of nitrogen oxides under atmospheric conditions. The results pertaining to these studies provide support for the continual development of broad bandwidth laser technology as a powerful ionization method for analytical applications. A comparison to previously reported narrow bandwidth REMPI results using the same APLI-MS will be made in addition to comments concerning future developments and experiments.