Two versions are described of a sliding bar vacuum lock for the introduction of solid samples into the ion source of a mass spectrometer. Sealing is obtained by three stage differential pumping without the use of gaskets. The first version, having a bar diameter of 25 mm, can be used up to 2-kV accelerating voltage. The second one, having a 50-mm diameter, is double acting and can be used up to 15 kV.
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Boerboom et al. (1964) studied this question.
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