Thermo Scientific TSQ Quantum XLS User Manual

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Functional Description
Mass Spectrometer
26 TSQ Quantum XLS Series User Guide Thermo Scientific
EI/CI Ion Source
The EI/CI ion source forms gas phase sample ions from sample molecules that elute from the
GC or are introduced by the direct sample probe. See Figure 15. You can operate the ion
source in either the electron ionization (EI) or chemical ionization (CI) mode. See “Ionization
Modes” on page 3.
Figure 15. Ion source of the TSQ Quantum XLS Series mass spectrometer
The ion volume, located in the center of the ion source, is the site where electrons interact
with sample or reagent gas molecules to form ions. Three exchangeable ion volumes and
ion volume holders are available for use in the ion source. See Figure 16. The choice of ion
volume depends on the ionization mode. The open EI ion volume is open on the analyzer
end, with a relatively large electron entrance hole. The closed EI ion volume has a smaller ion
exit hole than the EI ion volume. This results in a higher pressure of analyte and greater
sensitivity, but less dynamic range. The CI ion volume is closed on the analyzer end, except
for a small ion exit hole and a relatively small electron entrance hole. In the CI mode, you
must maintain a relatively high reagent gas pressure.
Magnets and
magnet yoke
Filament
EI/CI source
PCB
Heater ring
Ion source
block
Heated Q0 quadrupole
assembly
L1, L2, L3, lens
assembly

Thermo Scientific TSQ Quantum XLS Specifications

General

Brand	Thermo Scientific
Model	TSQ Quantum XLS
Category	Laboratory Equipment
Language	English