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Tips & Tools
Visual appearance is not an
accurate guide to cleanliness
of the CI ion source. The CI ion
source can show little or no
discoloration yet still need cleaning.
Chemical Ionization (CI) Ion Source
Because the CI ion source operates at much higher pressures than the EI ion source, it
will probably require more frequent cleaning than the EI ion source.
The source should be cleaned whenever there are performance anomalies that are
associated with a dirty ion source. Let analytical performance be your guide.
When cleaning the CI ion source, concentrate on the CI repeller, ion source body, and
draw out plate. Be sure to clean the 0.5 mm diameter holes in the ion source body and
draw out plate.
Cleaning the ion source is very similar to cleaning the EI ion source. Use the same EI
cleaning procedure with the following exceptions:
• The CI ion source may not look dirty but deposits left by chemical ionization are very
difficult to remove. Clean the CI ion source thoroughly.
• Use a round wooden toothpick to gently clean out the electron entrance hole in the
source body and the ion exit hole in the draw out plate.
• Do not use halogenated solvents. Use hexane for the final rinse.
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