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To Set Up the Software for CI Operation
Always verify GC/MS performance in EI before switching to CI operation.
CA UT IO N
Procedure
1
2
Table 17
Default Tune Control Limits, used by CI autotune only
Reagent gas
Ion polarity
Abundance target
Peakwidth target
Maximum repeller
Maximum emission
current, µA
Max electron energy, eV
Notes for
• N/A Not available. There are no PFDTD ions formed in PCI with any
5977 Series MSD Operation Manual
From the Tune and Vacuum Control view, select Load Tune Parameters from the
File menu and load the tune file PCICH4.U.
If CI autotune has never been run for this tune file, the software will
prompt you through a series of dialog boxes. Accept the default values
unless you have a very good reason for changing anything.
The tune values have a dramatic effect on MSD performance. Always start
with the default values when first setting up for CI, and then make
adjustments for your specific application. See
for the Tune Control Limits box. These limits are used by Autotune only.
They should not be confused with the parameters set in Edit MS
Parameters or with those appearing on the tune report.
Methane
Positive
Negative
6
6
1x10
1x10
0.6
0.6
4
4
240
50
240
240
Table
17:
reagent gas but methane, hence, CI autotune is not available with these
configurations.
Operating in Chemical Ionization (CI) Mode
Isobutane
Positive
Negative
6
N/A
1x10
N/A
0.6
N/A
4
N/A
50
N/A
240
Table 17
for default values
Ammonia
Positive
Negative
N/A
1x10
N/A
0.6
N/A
4
N/A
50
N/A
240
4
6
99
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