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Table 6-10 IDA Criteria (continued)
Description
Label
Select the check box to use the Neutral Loss criteria. Click the link to open the Neutral Loss
dialog and edit the criteria.
When neutral loss is selected, the software compares mass lists from two TOF MS experiments
with different CE values (Low/High CE values), the precursor masses that have mass
differences within the tolerance (mass) are trigged for MS/MS.
Note:
Only the precursor ion in a low CE survey scan is trigged by MS/MS. If the neutral
loss filter is selected, then the neutral loss ions are exclusively selected for IDA experiments.
CE values for the TOF MS method are not available after the Neutral Loss feature is selected.
• Low CE (survey scan): Set the collision energy that applies to the first TOF MS experiment.
• High CE (second scan): Set the collision energy that applies to the second TOF MS
experiment.
Note:
High CE is greater than the Low CE value for positive polarity. Low CE is greater
than the High CE value for negative polarity.
• Tolerance (mass): Specify the tolerance applied to the mass difference. The default value
is 0.02 Da.
Neutral Loss
Calculate the Dynamic Collision Energy for MS Methods
1. Open the MS Method workspace.
2. Create or open an MS method that contains IDA criteria or SWATH
®
application criteria.
3. Click
Advanced > Dyanamic collision energy.
4. Modify the information in the fields, as required.
5. Do one of the following:
• To use previously saved default values to calculate the dynamic CE, click
Load Default Settings
.
• To save the current values as the default values to be used to calculate the dynamic CE in new methods,
click
Save as Default Settings
.
• To apply the current values to the current method to calculate the dynamic CE, click
Apply
.
• To close the dialog and abandon any changes, click
Cancel
.
SCIEX X500 QTOF System
System User Guide
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RUO-IDV-05-2334-E
Operating Instructions—Software