1824447
Mind Map by anna.mat1997, updated more than 1 year ago
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Created by anna.mat1997
about 6 years ago
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Description
Mass Spectrometry
1 Uses
1.1 Relative atomic mass
1.2 Relative molecular mass
1.3 relative isotopic abundance
1.4 Molecular structure
2 Step 1- Vaporisation
2.1 The sample is vaporised
by an electrical heater
3 Step 2- Ionisation
3.1 The gas particles are bombarded with high
energy electrons to ionise them by knocking
off electrons, leaving positive ions.
4 Step 3- Acceleration
4.1 The positive ions are accelerated by an electric field
5 Step 4- Deflection
5.1 The positive ions' paths are altered with a magnetic field. Lighter ions have less
momentum so are deflected more than heavier ions. For a given magnetic field,
only ions with a particular mass/charge ratio make it to the detector.
6 Step 5- Detection
6.1 The magnetic field strength is slowly increased. As
this happens, different ions can reach the detector. As
they hit the detector they release a current.The bigger
the current the more of that isotope is present in the
sample. A mass spectrum is produced.
