sample is vaporised before entering mass spectrometer.
M (s) → M (g)
or M (l) → M (g) Step 2 Sample enters the low pressure ionisation chamber where an electron beam ionises the sample.
M (g) → M + (g) + e - Step 3 Ions are accelerated to high speeds by an electric field. Step 4 Ions pass through a perpendicular magnetic field which bends the path of the ions dependent on their mass-to-charge ratio.
Heavier ions are deflected less than lighter ions. Step 5 Ions with a particular mass reach the collector. Different masses can be collected by changing the magnetic or electric field. Step 6 The detector identifies the mass of each ion from its path. Data is recorded as a mass spectrum.