Tutorial: Fundamentals of GC/MS

The following web pages are Flash based tutorials that outline the Fundamentals of GCMS. To learn more about Flash, you can visit the Adobe website.


A mass spectrometer is an instrument that measures the mass of microscopic particles such as molecules and atoms. We can identify a molecule and quantify the amount of target chemicals in mixtures from this information. Mass of natural materials and units of mass will be explained here.
  • Mass of Materials
  • Mass Number and Isotope
  • Isotopic Abundance of Carbon Atoms
  • Isotope Abundance Table
  • Molecular Weight
Ionization produces positively- and negatively-charged atoms, mplecules, or fragments called ions. An overview of a mass spectrum will be provided and various types of ions will be introduced.
  • Example of Mass Spectrum
  • Base Peak
  • Fragment Ion
  • Isotope Peak

For Research Use Only. Not for use in diagnostic procedures.