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The base peak in a mass spectrum is the peak of

  • A.greatest intensity
  • B.greatest mass to charge ratio
  • C.lowest mass to charge ratio
  • D.the unfragmented molecular ion always

Answer: A

Correct answer: greatest intensity

The base peak is the tallest peak in the spectrum, and all other intensities are quoted as a percentage of it. It corresponds to the most stable fragment ion, which is often not the molecular ion at all - in many compounds the molecular ion fragments so readily that it is weak or entirely absent, which is why soft ionisation methods were developed.

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