Ci Ion Source - Agilent Technologies 7000 Triple Quadrupole GC/MS Maintenance Manual

7
Analyzers and Collision Cell

CI Ion Source

The CI ion source
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
150
(Figure 28

CI ion source

Interface tip seal
Interface tip
Interface cover
CI ion source tip seal
and Figure 29) is similar to the EI source, but
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