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.
Approximately half the samples are analyzed using a Finnigan DeltaPlus XP mass spectrometer for measurement of O2/N2/Ar as well as d18O of O2 and d15N of N2