62 Agilent 6400 Series Triple Quad LC/MS Concepts Guide
3 Agilent Triple Quadrupole MS and Sensitivity
Detector
Detector
The High Energy Dynode detector assembly is unique to Agilent
(Figure 30).
The two dynodes are orthogonal to the ion beam and neutrals.
This orientation reduces the possibility of neutral molecules
impacting the detector while at the same time attracting the
ions with high voltages. The dynodes serve to convert the ions
to electrons before they impact the multiplier. The off-axis
design also allows neutrals to pass through without hitting the
detector.
The multiplier has a long lifetime since only electrons are
allowed to impact it. Ions never impact its surface.
Figure 30 Detector components
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