chemical ionisation

chemical ionisation

A process of ionisation involving the reaction of a reagent ion and a neutral molecule to yield a charged ionic form of the molecule.
The first step in chemical ionisation is the creation of the reagent ion by electronically ionising reagent gas molecules, which are present in great excess. A stable population of reagent ions is formed through ion–molecule reactions, which eventually react with the neutral gas-phase molecules. In a common example, methane gas is ionised to form predominantly CH5, which then reacts with the neutral sample molecule in a process of protonation to form MH.
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Subject of this procurement is a high-resolution time-of using chemical ionisation (high-resolution time-of-flight mass spectrometer chemical ionization, HRToF-CIMS).
Current ionisation methods: The use of 18 specified ionisation methods in mass spectrometry, namely atmospheric pressure chemical ionisation (APCI), atmospheric pressure photoionisation (APPI), chemical ionisation (CI), desorption chemical ionisation (DCI), desorption/ionisation on silicon (DIOS), direct analysis in real time (DART), electron ionisation (EI), electrospray ionisation (ESI), fast atom bombardment (FAB), field desorption (FD), field ionisation (FI), glow discharge (GD), inductively coupled plasma (ICP), ion attachment ionisation (IAI), matrix-assisted laser desorption ionisation (MALDI), negative ion electron capture (NIEC), thermal ionisation (TI), thermospray or other (more than 30 ionisation methods were identified in this market study).
Capabilities such as MS/MS, Chemical Ionisation, Field Ionisation or the ability to perform GCxGC-MS are considered highly desirable.

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