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Ion Transmission and Mass Analysis
Ion Optics
32 Orbitrap Fusion Series Hardware Manual Thermo Scientific
The TK1 and TK2 lenses are metal discs with a circular hole in the center through which the
ion beam passes (Figure 17). The mass spectrometer applies an electrical potential to the lens
to accelerate (or decelerate) ions as they approach each lens and to focus the ion beam as it
passes through each lens. Lens TK1 acts as vacuum baffle between the MP0 multipole and the
Q1 quadrupole mass analyzer. It also shields MP0 from the RF voltage that the mass
spectrometer applies to Q1, and vice versa.
Figure 17. TK lens (both sides)
MP1 Ion Optics
The MP1 ion optics transmit ions from quadrupole Q1 to the C-trap. The MP1 ion optics
include multipole MP1 and the C-trap gate lens. For the location of these components, see
the schematic in Figure 13.
Multipole MP1 is an array of circular rods that act as an ion transmission device (Figure 18).
The mass spectrometer applies an RF voltage to the rods, generating an electric field that
guides the ions along the axis of the multipole. The C-trap gate lens focuses the ions as they
enter the C-trap.
Figure 18. Multipole MP1 (Orbitrap Fusion and Orbitrap Fusion Lumos MSs)
Orbitrap Fusion MS Orbitrap Fusion Lumos MS
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