Suitable for gaseous samples (e.g., volatile gases, breath gases)
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Gaseous/vaporized samples (e.g., headspace gases, VOCs) are delivered directly into the ionization zone via carrier gas (e.g., N₂) or heated transfer lines. A high-voltage corona discharge needle (2-5 kV) ionizes ambient gases (e.g., N₂, H₂O) at atmospheric pressure, producing primary reagent ions (e.g., H₃O⁺, O₂⁻). Volatile analyte molecules undergo: Proton transfer in positive ion mode → [M+H]⁺; Electron capture in negative ion mode → [M-H]⁻, generating stable ions for detection.
The vAPCI (Vapor-phase Atmospheric Pressure Chemical Ionization) source is an optimized ambient ionization technology for gaseous/highly volatile compounds. By merging conventional APCI with direct vapor-phase sample introduction, its unique gas-phase ionization mechanism eliminates dependency on liquid-phase nebulization—delivering high-efficiency, ultrasensitive detection for volatile analytes in critical applications: Environmental monitoring; Industrial process control; Breath diagnostics
