Operating in Chemical Ionization (CI) Mode 4
5975 Series MSD Operation Manual for MassHunter 117
To Use Other Reagent Gases
This section describes the use of isobutane or ammonia as the reagent gas. You
should be familiar with operating the CI-equipped 5975 Series MSD with
methane reagent gas before attempting to use other reagent gases.
Changing the reagent gas from methane to either isobutane or ammonia
changes the chemistry of the ionization process and yields different ions. The
principal chemical ionization reactions encountered are described in general
in Appendix A, “Chemical Ionization Theory. If you are not experienced with
chemical ionization, we suggest reviewing that material before you proceed.
CAUTION
Do not use nitrous oxide as a reagent gas. It radically shortens the life span of the
filament.
CAUTION
Not all setup operations can be performed in all modes with all reagent gases. See
Table 18 for details.
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