Aromatic molecules are detected in ambient air by a method that provides on-line results. The method is based on sensitive multiphoton ionization (MPI) of these molecules by UV laser pulses. Ions are identified and quantified by their induced electrostatic mirror image during their flight toward a collecting electrode. Only moderate vacuum is needed and quantification is straightforward. The expected performance of the new detection principle is analyzed by computer simulations, and then tested for some aromatic compounds in ambient air (ppm to ppb range). The method has the potential of simultaneous multicompounds analysis, however, it has only been tested for simple mixtures. The very simple experimental setup that is used, is compensated by a comprehensive set of chemometric algorithms. These algorithms are needed for identification of aromatic ions and for resolution of mixtures.
|Number of pages||11|
|Journal||Proceedings of SPIE - The International Society for Optical Engineering|
|State||Published - 10 Feb 1995|
|Event||Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements 1994 - McLean, United States|
Duration: 6 Nov 1994 → 10 Nov 1994