Abstract
The fragmentation of sulfur trioxide has been measured with a mass spectrometer system composed of a quadrupole mass filter and an electron impact ionization source. The positive ion mass spectrum of SO 3 is for the most part composed of SO 3 +, SO 2 + and SO + ions. Account must be taken of the formation of SO 2 + and SO 3 + ions by electron impact ionization of SO 3 if a quantitative estimate of both the SO 3 and SO 2 content of a process stream is to be made. Calibration curves may be constructed without a detailed study of the ion transmission characteristics of the mass spectrometer system employed.
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