质谱教程（The Chemistry Hypermedia Project）

仪器资料 · 发表于 2018-7-7 15:57:29

质谱教程（The Chemistry Hypermedia Project）
Mass spectrometers use the difference in mass-to-charge ratio (m/e) of ionized atoms or
molecules to separate them from each other. Mass spectrometry is therefore useful for
quantitation of atoms or molecules and also for determining chemical and structural
information about molecules. Molecules have distinctive fragmentation patterns that provide
structural information to identify structural components.
The general operation of a mass spectrometer is:
1. create gas-phase ions
2. separate the ions in space or time based on their mass-to-charge ratio
3. measure the quantity of ions of each mass-to-charge ratio
The ion separation power of a mass spectrometer is described by the resolution, which is
defined as:
R = m / m,
where m is the ion mass and m is the difference in mass between two resolvable peaks in a
mass spectrum. E.g., a mass spectrometer with a resolution of 1000 can resolve an ion with a
m/e of 100.0 from an ion with an m/e of 100.1.

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