3. Gas phase ionization methods at atmospheric pressure
The mechanisms that form positive or negative ions in an API source are classically grouped into two categories: gas-phase reactions in the API chamber, and liquid-phase reactions in the sample solution. Ionization in an APCI or APPI source is almost exclusively controlled by gas-phase ion-molecule reactions, unlike in an ESI source where liquid-phase and gas-phase ionization mechanisms may overlap.
Gas-phase ionization methods produce ions from neutral samples that can be vaporized by heat at atmospheric pressure. With the exception of a few salts, such as ammonium acetate or formate, which can be vaporized to produce ...
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Gas phase ionization methods at atmospheric pressure
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