Glossary - Thermo Scientific TSQ Altis Hardware Manual

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Thermo Scientific

Glossary

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API ion transfer tube A tube assembly that assists in desolvating ions that are produced by
the ESI, APCI, or NSI nozzle.
API ion transfer tube offset voltage A DC voltage applied to the ion transfer tube. The
voltage is positive for positive ions and negative for negative ions.
API source The sample interface between the liquid chromatograph (LC) and the mass
spectrometer (MS).
API stack Consists of the components of the API source that are held under vacuum and
includes the ion spray cone, ion transfer tube, exit lens, and ion transfer tube mount.
atmospheric pressure chemical ionization (APCI) A soft ionization technique operating at
atmospheric pressure. Electrons from a corona discharge initiate the process by ionizing the
mobile phase vapor molecules, forming a reagent gas. Charged species are generated in the
gas phase.
atmospheric pressure ionization (API) Ionization performed at atmospheric pressure by
using atmospheric pressure chemical ionization (APCI), heated-electrospray (H-ESI), or
nanospray ionization (NSI).
atmospheric pressure photoionization (APPI) A soft ionization technique that shows an
ion generated from a molecule when it interacts with a photon from a light source.
auxiliary gas The outer-coaxial gas (nitrogen) that assists the evaporation of the sample
solution as it exits the ESI, APCI (optional), or APPI (optional) spray insert. The mass
spectrometer heats this gas to the user-specified vaporizer temperature.
L M N O P Q
TSQ Altis, Quantis, and Fortis Hardware Manual
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