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Thermionic cathode ionization gauges

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Total and Partial Pressure Measurement in Vacuum Systems

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Abstract

In a gas at low pressure the number of positive ions produced by the passage of a stream of electrons is directly proportional to the molecular concentration. The linear relation between ionization and density holds from zero gas pressure up to the point at which ion formation is sufficient to alter effectively the current and energy of the electron stream. Since the gas pressure (at a constant temperature) is directly proportional to its density, the positive ion current produced by a steady electron current may be used as an indicator of pressure.

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  1. Department of Electrical Engineering and Electronics, University of Liverpool, England

    J. H. Leck (Emeritus Professor)

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Leck, J.H. (1989). Thermionic cathode ionization gauges. In: Total and Partial Pressure Measurement in Vacuum Systems. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0877-5_3

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