Analyzer 7
5977B Series MSD Troubleshooting and Maintenance Manual 195
CI Ion Source
The CI ion source is similar in shape to the traditional EI ion source, but only
has one part in common with the EI ion source — the entrance lens. The single
CI filament has a straight wire and a reflector. A “dummy” filament provides
connections for the other wires.
The holes in the ion source (electron-entrance and ion-exit) are very small
(0.5 mm), making it possible to pressurize the ionization chamber. Both the
source body and the plate are at repeller potential, electrically isolated from
the radiator and the interface tip. The seal for the interface tip (Figure 46 on
page 196) ensures a leak-tight seal and electrical isolation between the CI
interface and ion source.
Ion source body
Figure 45 CI ion source structure
Entrance lens
Filament
Drawout cylinder
Drawout plate
Dummy filament
Ion focus lens
Lens insulation
Repeller
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