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CI Background Mass Set Too Low.
CI Background Mass Properly Set.
How to Determine the Proper Ejection Amplitude
The proper setting for the Reagent Ion Eject Amplitude will remove EI generated
fragments but not affect the reagent ions.
With the CI reagent connected and properly adjusted, click the CI Gas control on
the Manual Control page in System Control to open the CI gas valve solenoids.
Turn on the trap and observe the spectrum over the scan range specified in the
acquisition method, (don’t use Adjust CI Gas). Temporarily set the CI
background mass to a value below that of the highest mass reagent ion (record
the previous value so you can restore it when you finish with this procedure).
Adjust the Ejection Amplitude until the reagent ion starts to be diminished.
Restore the CI background mass and verify that no reagent ions remain.
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