Agilent Technologies 7000 Series Operating Manual page 146

6 Operating in CI Mode
To Pumpdown and Switch from EI to CI Mode
14 Click Autotune to start the autotune. At the completion of the autotune a
15 Review the Tune Report. If the results are acceptable, save the autotune by
Table 13 Default Tune Control Limits, used by CI autotune only
Reagent gas
Ion polarity
Abundance target
Peak width target
Maximum repeller
Maximum emission current, µA
Max electron energy, eV
Notes for
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146
Tune Report is printed.
clicking the Files and Report tab, then click Save. Default tune control limits
are shown in Table 13.
Methane
Positive
6
1×10
0.7
4
240
240
Table 13:
N/A: Not available.
Abundance target: Adjust higher or lower to get desired signal abundance.
Higher signal abundance also gives higher noise abundance. This is adjusted
for data acquisition by setting the EMV in the method.
Peakwidth target: Higher peakwidth values give better sensitivity, lower
values give better resolution.
Maximum emission current: Optimum emission current maximum for NCI is
very compound-specific and must be selected empirically. Optimum
emission current for pesticides, for example, may be about 200 µA.
Ammonia
Negative Positive
6
1×10 N/A
0.7 N/A
4 N/A
50 N/A
240 N/A
7000/7010 Series TQ GC/MS Operating Manual
Negative
6
1×10
0.7
4
50
240