[PDF] Atmospheric pressure chemical ionization mass spectrometry of

Atmospheric pressure chemical ionization (APCI), a widely used ionization technique in mass spectrometry, is similar to atmospheric pressure photoionization (APPI). It is advantageous for its ability to easily ionize and detect nonpolar or slightly polar species.
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  • How does atmospheric pressure chemical ionization work?

    The solvent and sample are vaporized by the heater in the injector and ejected from the injector outlet. At the outlet of the injector, the solvent is ionized by electro-acupuncture corona discharge. The solvent ions react with the sample molecules to ionize the sample.

  • What is the chemical ionization process in mass spectrometry?

    Chemical ionization mass spectrometry (CIMS) is a technique for forming ions of the compound of interest (analyte, A) by ion/molecule reactions from reactant ions of a reagent gas that is generally present in a much greater abundance than the analyte.

  • What is the atmospheric pressure interface mass spectrometer?

    The Atmospheric Pressure interface Time of Flight Mass Spectrometer is used to measure the chemical composition of naturally charged ions (positive or negative) present in the atmosphere at very low concentration (few hundreds per cc).
  • With APCI, a protonated solvent molecule donates a proton to the analyte in the gas phase. In general, APCI is better suited for ionization of non-polar, volatile low molecular weight molecules while ESI is better suited for more polar, non-volatile molecules.
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