150 Troubleshooting and Maintenance Manual
7 Analyzers and Collision Cell
CI Ion Source
The CI ion source (Figure 28 and Figure 29) is similar to the EI source, but
only has one part in common with the EI 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 CI interface tip. The seal for the interface tip ensures a
leak-tight seal and electrical isolation between the CI interface and ion source.
Figure 28 CI ion source tip seal
CI ion source
Interface tip seal
Interface tip
Interface cover
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