Instrument: Mass Spectrometer

Instrument Short Name: Mass Spec
(http://vocab.nerc.ac.uk/collection/L05/current/LAB16/)
Instrument Description:

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.

PI supplied instrument name: Pfieffer 400 series quadrupole mass spectrometer
Dataset-specific description

N2 excess were determined from N2/Ar ratios measured using the procedures described by Charoenpong et al. (2014) with the exception that the measurements were made at sea using a Pfieffer 400 series quadrupole mass spectrometer system.