Mass Spectrometry

Mind Map by anna.mat1997, updated more than 1 year ago
Created by anna.mat1997 about 6 years ago


Mass Spectrometry

Resource summary

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.
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