Abstract
The theory of virtual cathode formation in electron beams is reviewed. Destruction of a virtual cathode by the accumulation of residual gas ions is shown to occur in a time which is inversely proportional to the pressure. This forms the basis of a method of measuring low pressures which may have some advantages over conventional ionization gauges, especially in the presence of high magnetic fields. Experimental results are presented where this effect is used to measure pressures in the range 10-4-4 ? 10-9 torr.
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