mass spectrometry

View mindmap
  • mass spectrometry
    • determines relative molecular mass
    • gives data on relative isotopic abundance and relative isotopic mass
      • isotopes
        • same number of protons different number of neutrons
    • calculate relative atomic mass
      • using masses and abundance's fro each isotope
    • for identifying elements
    • Time of flight (TOF)
      • 1.ionisation
        • electrospray: a sample is dissolved and pushed through at high pressure. a high voltage causes each particle to gain H+. sample turned into gas made of positive ions
        • electron impact: the sample is vaporised and an electron gun is used to fire high energy electrons at it. this knocks one electron off each particle, so they become +1 ions
        • 2.acceleration
          • positively charged ions are accelerated by an electric field so they have the same KE.
          • 3. flight tube (ion drift)
            • ions enter no electric field area so they drift. lighter ions drift through faster
            • 4. detection
              • the detector detects charged particles and a mass spectrum is produced


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all atomic structure resources »