AB Sciex 4500 Series System User's Manual page 49

Figure 5-1 Ion optics path and parameters (Continued)
Item Parameter
1 GS2 (Gas 2)
1 TEM
(Temperature)
2 EP (Entrance
Potential)
2 Q0 Trapping
System User Guide
Document Number: D5030863 A
Parameter Use
Type
Source and The GS2 parameter controls the
gas auxiliary, or turbo, gas. It is used to
help evaporate the solvent to
produce gas phase sample ions.
Source and The TEM parameter controls the
gas temperature of the turbo gas in the
TurboIonSpray
temperature of the probe in the
heated nebulizer (or APCI) probe.
Compound The EP parameter controls the
potential difference between the
voltage on Q0 and ground. The
entrance potential guides and
focuses the ions through the high-
pressure Q0 region.
Use the preset value.
Compound The Q0 trapping parameter
controls the storage of ions in the
Q0 region. It is used to increase
sensitivity and duty cycle by
trapping ions in the Q0 region while
ions are being mass-selectively
ejected from the LIT. Use fixed fill
time with this parameter.
Either select or clear the feature
based on the experiment.
The recommended fixed fill time to
use with Q0 trapping is 20 ms or
greater.
Basic Acquisition Methods
®
probe or the
4500 Series of Instruments
Scan Type
All
All
All
EMS, EMC,
EPI, ER, and
MS/MS/MS,
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