Small mass spectrometer with extended measurement capabilities at high pressures

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Abstract
For the in situ investigation of planetary atmospheres a small Mattauch-Herzog mass spectrometer has been developed. Its high-pressure performance has been improved by incorporating differential pumping between the ion source and the analyzing fields, shortening the path-length as well as increasing the extraction field in the ion source. In addition doubly ionized and dissociated ions are used for mass analysis. These measures make possible operation up to 10−2 millibars. Results of laboratory tests related to linearity, dynamic range, and mass resolution are presented, in particular for CO2.