G-2 Theory and principles of operation
Electron Impact Ionization
Chemical Ionization
When the source is operated in the Chemical Ionization (CI) mode, a reagent
gas (the CI gas) is admitted into the ion source at a relatively high pressure.
The gas molecules are ionized by the electron beam and sample ions are
generated in reactions with these gas ions. CI is a softer ionization technique
than EI, producing less sample fragmentation and, generally, a stronger
molecular ion.
AutoSpec functionality
The figure “AutoSpec Premier components:” on page G-4 shows the component
locations for the instrument.
Electron trap
Trap voltage
Ion repeller
Repeller voltage
Ion chamber
Emission current
Emission
current
Filament current
Filament
Electron energy (volts)
Ion current
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