Thermo Orbitrap Fusion Series - Figure 28. Linear Ion Trap (LIT) (Orbitrap Fusion MS); Figure 29. Assembly for the Linear Ion Trap

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Ion Transmission and Mass Analysis
Mass Analyzers
40 Orbitrap Fusion Series Hardware Manual Thermo Scientific
Figure 28. Linear ion trap (LIT) (Orbitrap Fusion MS)
Inside the mass analyzer cells are square arrays of precision-machined and precision-aligned
hyperbolic rods that have three sections (Figure 29). Ions are ejected only through slots in the
X-rods during scan-out.
Figure 29. Assembly for the linear ion trap
Axial Trapping Voltages
The Orbitrap Fusion Series MS uses six DC axial trapping voltages, one for each rod section
on both cells. These voltages establish axial trapping by creating potential wells. These DC
axial trapping voltages allow the mass analyzer to perform its storage and scan-out functions.
High pressure cell
Low pressure cell
Lens TL3
Lens TL2
Lens TL1
Y
X
Z
Back section
Center section
Front section