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EI, CI

EI (hard ionization)

Gas-phase molecules enter source through heated probe or GC column

70 eV electrons bombard molecules forming M+* ions that fragment in unique reproducible way to form a collection of fragment ions

EI spectra can be matched to library stds

CI (soft ionization)

Higher pressure of methane leaked into the source (mtorr)

Reagent ions transfer proton to analyte

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