Mass spectrometry

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4 Terms

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Stages of mass spectrometry

  1. vaporisation of sample

  2. ionisation by electron gun

  3. acceleration and focus by electric field

  4. deflection by magnetic field

  5. detection by ion counter

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What are detected?

Positive ions

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How are ions detected?

  • As a mass-charge ratio (m/z)

  • If z=1 then the m/z value is equal to relative isotopic mass 

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What information does it give?

  • isotopes present

  • percentage abundance of each isotope 

  • relative abundance of each ion