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Functional Description
_______________________________________________________________Mass Analyzer
__________________ LCQ Deca XP Plus Hardware Manual _________________
1-19
1.3 Mass Analyzer
The mass analyzer is the site of mass analysis (that is, ion storage, ion
isolation, collision induced dissociation, and ion ejection). The mass analyzer
is mounted on the analyzer mount opposite the octapole.
The mass analyzer includes three stainless steel electrodes: the entrance
endcap electrode, the exit endcap electrode, and the ring electrode. The inner
surfaces of electrodes are hyperbolic. Together, they form a cavity in which
the mass analysis occurs. See Figure 1-8.
The entrance endcap electrode is the electrode that is closest to the ion optics,
and the exit endcap electrode is the electrode that is closest to the ion
detection system. Both endcap electrodes have a small hole in their centers to
permit the passage of ions into and out of the mass analyzer cavity. The ring
electrode is located between the endcap electrodes. Ions produced in the API
source enter the mass analyzer cavity through the entrance endcap electrode.
Ions can be ejected through either endcap electrode during mass analysis. Ions
that are ejected through the exit endcap electrode are focused by the
conversion dynode accelerating potential through the exit lens (at ground
potential) towards the ion detection system.
Helium damping gas enters the mass analyzer cavity through a nipple on the
exit endcap electrode.
The entrance endcap electrode, exit endcap electrode, and ring electrode are
separated by two quartz spacer rings. The spacer rings position the electrodes
at the proper distance apart and also serve as electrical insulators. Two
nonconducting analyzer posts pass through both endcap electrodes and screw
into the analyzer mount (also nonconducting). A spring washer and analyzer
nut on the end of each post apply a force to the exit endcap electrode that
holds the electrodes and spacers in place.
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