Abstract
Abstract : Experiments have been performed with a modulated Bayard-Alpert gauge at a pressure of hydrogen less than 10 to the minus 10 torr. A component of ion current was found which behaved, under modulation, as if it originated in the gas phase, but which was localized to the gauge under study. This component was identified as protons, on the basis of parallel experiments with a mass spectrometer in the same ultra-high vacuum system. This proton current introduces an error into pressure measurement made with the modulated Bayard-Alpert gauge. The error can be reduced by operating the gauge with a relatively high electron current (8 ma). (Author)
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