Ionization Process of NCI
There are two main ionization processes for NCI: resonance electron capture producing a molecular ion and dissociative electron capture causing fragmentation. Electrons emitted from a filament lose their energy to become thermal electrons by collision with reagent gas and ionization of reagent gas molecules. Nearly 0eV electrons are captured by molecules so that molecular ions are produced. If electrons have enough energy to break up molecules, fragmentation occurs.
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