image of multiwall carbon nanotube sample grown on substrate.
Illustration of source ionization gauge.
(a) Emission performance of the electron source. sample: , -gate spacing: , -anode spacing: . emission reproducibility was achieved between operation cycles, (b) emission stability under different vacuum conditions for electron source, emission field: .
System pressure and partial pressures variations with operating the source. When reaching highest test current of total and partial pressures are: (total), , , , , and . The error bars show the uncertainties of partial pressure measurements by the .
Measurement linearity between ion collection current and system pressure for ionization gauge tested in nitrogen. Gauge electrical parameters: potential of anode and reflector: ; potential of source gate: ; potential of source cathode, focus plate, and ion collector: 0; anode current: . The measurement errors are showed with error bars.
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