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A new approach for fast, simultaneous NO/NO2 analysis: application of basic features of multiphoton-induced ionization and dissociation of NOx

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A new method of simultaneously recording NO and NO2 concentrations in complex gas mixtures is described. This method is based on resonance enhanced multiphoton ionization (REMPI), on time-of-flight mass analysis, and on monitoring the kinetic energy released upon dissociation of NO2. Its benefits are high speed and high flexibility. NO/NO2 analysis can therefore be combined with the simultaneous monitoring of other components. For instance, NH3 is a compound of interest when studying the chemical reactions of NOx in catalytic converters of combustion engines. The spectroscopic excitation schemes used for this new method are discussed in detail. Its reliability has been demonstrated by performing measurements at an industrial motor test facility. This novel technique performs well in comparison with conventional NOx analysis using chemiluminescence detection.

NOx-analysis of Diesel engine exhaust. Simultaneous fast detection of NO and NO2 by LAMS (laser mass spectrometry). Comparison of LAMS(NOx) with conventional CLD (chemiluminescence detection)

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  1. The F+ fragment ion spectrum of molecule M is the spectrum obtained when exciting M while tuning the laser wavelength and monitoring F+ions

  2. This test facility is run by the University of Applied Sciences in Landshut, Germany in cooperation with BMW-Munich


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Bornschlegl, A., Weishaeupl, R. & Boesl, U. A new approach for fast, simultaneous NO/NO2 analysis: application of basic features of multiphoton-induced ionization and dissociation of NOx . Anal Bioanal Chem 384, 161–168 (2006).

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