an instrument for analyzing ionized particles by passing them through electric and magnetic fields, typically designed to focus particles of equal mass to a point where they are detected: used esp. to determine the abundance of chemical compounds or isotopes
also mass spectrometer
An instrument used to determine the masses of atoms or molecules, in which a beam of charged particles is passed through an electromagnetic field that separates particles of different masses. The resulting distribution or spectrum of masses is recorded on a photographic plate.
- mass spectrography
(plural mass spectrographs)
- (physics, analytical chemistry) A mass spectrometer