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How are ions fragmented in a tandem experiment?

  • A.Passage through a strong magnetic field
  • B.Collision with an inert gas
  • C.A second beam of energetic electrons
  • D.Irradiation with an intense laser pulse

Answer: B

Collision-induced dissociation accelerates the selected ion into argon or nitrogen, converting kinetic energy into internal energy until the ion breaks. Electron and photon methods exist for particular purposes, and a magnetic field only deflects. Converting motion into internal energy through collisions is a controllable way to supply exactly as much as is needed, which is why the collision energy is a tuned parameter of the method. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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