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Chemical ionization
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==Principles of operation== The chemical ionization process generally imparts less energy to an analyte molecule than does [[Electron ionization|electron impact]] (EI) ionization, resulting in less fragmentation<ref name=":5" /> and usually a simpler [[spectrum]]. The amount of fragmentation, and therefore the amount of structural information produced by the process can be controlled to some degree by selection of the reagent ion.<ref name=":5" /> In addition to some characteristic fragment ion peaks, a CI spectrum usually has an identifiable protonated [[molecular ion]] peak [M+1]<sup>+</sup>, allowing determination of the [[molecular mass]].<ref name="MSPA">{{cite book|title=Mass Spectrometry: Principles and Applications|last=de Hoffmann|first=Edmond|author2=Vincent Stroobant|publisher=John Wiley & Sons, Ltd.|year=2003|isbn=978-0-471-48566-7|edition=Second|location=Toronto|page=14}}</ref> CI is thus useful as an alternative technique in cases where EI produces excessive fragmentation of the analyte, causing the molecular-ion peak to be weak or completely absent.
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