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Text File  |  1992-09-03  |  280b  |  8 lines
  1. In physics, an apparatus for analysing
  2. chemical composition. Positive ions (charged
  3. particles) of a substance are separated by an
  4. electromagnetic system, which permits
  5. accurate measurement of the relative
  6. concentrations of the various ionic masses
  7. present, particularly isotopes.
  8.