Chemistry AS EL CI 6.5

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  • Created by: A.B.
  • Created on: 23-10-13 18:13
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  • EL The Mass Spectrometer CI 6.5
    • 1. Sample Inlet
      • Gases or liquids injected but solids are heated to vaporise them.
    • 2. Ionisation Area
      • A heated filament produces high energy electrons. These electrons bombard any atoms or molecules in the sample and knock the electrons out.
        • Cations are formed.
    • 3. Acceleration area
      • Electric field is used to accelerate any ions so that they all have the same kinetic energy.
    • 4. Drift Region
      • Vacuum here so ions do not collide with air molecules, which could change the direction of their flight path.
        • kinetic energy = mass x velocity
          • Heavier ions move through more slowly than light ions.
    • 5. Ion Detector
      • Light ions reach the detector before heavier ones.
      • A computer system converts the information into a mass spectrum.
    • The Mass Spectrometer and Isotopes
    • The mass spectrometer and molecules
      • The ion with the greatest mass corresponds to the molecular mass of the sample compound.
        • Called molecular ion.
        • Corresponds to the parent isotope minus an electron.
      • The most intense peak is called the base peak.
        • Many peaks because fragments are formed in the ionisation chamber.
      • The molecular ion breaks down into fragments


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