Thermo Scientific TSQ Series Hardware Manual page 42

2
Functional Description
Mass Spectrometer
Figure 16. Tube lens of the TSQ Quantum Access and TSQ Quantum Ultra
Rear
The TSQ Vantage uses an S-lens and exit lens rather than a tube lens and skimmer. The S-lens is
an ion transmission device consisting of progressively-spaced, stainless-steel electrodes. See
Figure
of opposite phase. As the rf amplitude increases, ions of progressively higher mass-to-charge ratios
pass through to the exit lens. During the tune procedure, the TSQ Vantage determines the
mass-dependent rf amplitudes for optimum transmission of ions through the lens. The maximum
amplitude is 300 V peak-to-peak.
Figure 17. S-lens of the TSQ Vantage
Front
Ions from the tube lens or S-lens pass through the skimmer
move toward the Q00 RF lens. The skimmer and exit lens act as a vacuum baffle between the
higher pressure ion source interface region (at 1.5 Torr) and the lower pressure Q00 ion optics
region (at 50 mTorr) of the vacuum manifold. The apertures of the skimmer and exit lens are offset
with respect to the bore of the ion transfer tube. This arrangement reduces the number of large,
charged particles that pass through the skimmer or exit lens into the mass analyzer, which reduces
detector noise. The tube lens and skimmer, or the S-lens and exit lens, mount to the ion source
interface cage.
24 TSQ Series Hardware Manual
17. A 650 kHz rf voltage is applied to the electrodes, and adjacent electrodes have voltages
(Figure 18) or exit lens (Figure 19) and
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