PerkinElmer Clarus SQ 8 MS Series Hardware Manual page 121

2. Set the values as shown in the following table.
Parameter: Parameter: CI+ Values CI+ Values and
Electron energy 30 eV
Emission Should be below 200 µA, although 200 to 300 µA is acceptable. (Above
200 mA may cause hydrocarbon "cracking" patterns with methane and
isobutane.) Emission measures the real emission current, i.e. the source
current from the source block, there is no trap "source current" in CI.
Lens 1 and 2 The tuning of these lenses may be different from the optimum values set
for EI, since the source pressure is much higher in CI.
Multiplier 1300V to 1600V
Ion Energy Approx. 1. Similar to EI.
Source temperature 150 ºC
Adjust the Reagent Gas for CI+
When running in the CI+ mode with reagent gas off, the resulting EI spectra have
about 10x lower sensitivity than with the EI source.
If using methane reagent gas, the reagent ions at m/z 17 (CH
be of approximately equal intensity. Maximize the m/z 29 intensity. With m/z 29
maximized, the ion at m/z 16 should be about 1% of the m/z 17 peak height. (Higher
and Comments: Comments:
+
) and 29 (C
5
Maintenance
+
H ) should
2 5
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