Ionisation - beam of electrons from 'electron fu' knock out electrons from atoms/molecules so they form positive ions (most end with a +1 charge)
Acceleration - positive ions are attracted towards negatively charged plates and accelerated to a high speed (dependent on mass)
- some ions pass through the slits in the plates, forming them into a beam
Deflection - beam of ions moves into a magnetic field at right angles to its direction of travel
- magnetic field defelcts the beam into an arc of a ircle
- deflection depeds ont he ratio of mass/charge, so heavier ions are deflected less than lighter ones
- stronger magnetic field = greater deflection
Detection - computer works out the mass/charge ratio by detecting the strength of the magnetic field when a particular ion hits the detector
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