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The design and construction of a new type of time-of-flight mass spectrometer is described. The instrument was designed to improve the ionization efficiency and to efficiently detect ions. The system performance was evaluated using the SIMION software, and was compared with the experimental results. The shapes of the repeller, extraction, and ground electrodes had a strong effect on the trajectory of ions in the processes of ion acceleration and focusing. The major difference between the theory and the experiment can be attributed to space-charge effects.

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Supersonic jet spectrometry combined with multiphoton ionization mass spectrometry has a distinct advantage with respect to selectivity over other conventional spectrometric methods.1 For example, it is difficult to differentiate isomers using conventional mass spectrometry, and, as a result, mass spectrometry is often combined with chromatography in order to accomplish this. However, this technique requires additional time for sample separation and, as a result, it is difficult to apply it to on-line, real-time monitoring of chemical species. Because of this, supersonic jet spectrometry/multiphoton ionization/time-of-flight mass spectrometry is the preferred technique for on-line, real-time monitoring of dioxins and dibenzofurans emitted from an incinerator.