An ionization gauge for molecular beam work has been developed which uses a field ionization tip as an ion source. Data are given regarding signal-to-noise ratio and sensitivity. Means of reducing the rate of tip deterioration are discussed and data given showing moderate reduction in signal strength over a 1 h period. Curves are given showing that the sensitive area of the gauge is small when compared to a 0.25 mm wide molecular beam.
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Woods et al. (1966) studied this question.
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