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Table 6-9 MS Method Parameters (continued)
Experiment
Definition
Parameter
TOF MS, TOF MSMS, Q1, IDA, SWATH,
MRM HR
Specify the ion source gas 1 flow. This parameter
controls the nebulizer gas for the TurboIonSpray
®
probe and the auxiliary gas for the APCI probe.
Ion source gas 1
TOF MS, TOF MSMS, Q1, IDA, SWATH,
MRM HR
Specify the temperature of the heater gas in the
ion source or the probe.
Temperature
TOF MS, TOF MSMS, Q1, IDA, SWATH,
MRM HR
Specify the ion source gas 2 flow. This parameter
controls the auxiliary, or turbo, gas for the
TurboIonSpray
®
probe. It is used to help evaporate
the spray droplets. Ion source gas 2 works in
conjunction with the temperature parameter.
Ion source gas 2
TOFMS, TOFMSMS, Q1, SWATH, MRM
HR, IDA
The CAD parameter controls the pressure of the
gas in the collision cell. The collision gas helps to
focus the ions as they pass through the collision
cell; the preset for the CAD parameter is in fixed
mode. For MS/MS scan types, the CAD gas helps
to fragment the precursor ions. When the precursor
ions collide with the collision gas, they dissociate
to form product ions.
Use the preset value and optimize for the
compound.
CAD gas
Experiment
TOF MS, TOF MSMS, Q1, IDA, SWATH,
MRM HR
Select the polarity appropriate to the charge of the
ion of interest.
Polarity
TOF MS, TOF MSMS, Q1, SWATH, MRM
HR, IDA
The nebulizer current parameter controls the current
applied to the corona discharge needle in the APCI
probe. The discharge ionizes solvent molecules,
which in turn ionize the sample molecules.
Nebulizer current
TOF MS, TOF MSMS, Q1, IDA, SWATH,
MRM HR, IDA
The voltage applied to the needle that sprays the
sample. The spray voltage parameter affects the
stability of the spray and hence the signal
sensitivity.
Spray voltage
System User Guide
SCIEX X500 QTOF System
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Operating Instructions—Software