Instrument: Mass Spectrometer
General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components.
Others are chromatographed to separate O2 and Ar from N2, followed by analysis of O2/Ar and the triple isotope composition of O2 using a Finnigan MAT 252 mass spectrometer.