Isotopes of nitrogen on Mars: Atmospheric measurements by Curiosity's mass spectrometer.

[1] The Sample Analysis at Mars (SAM) instrument suite on the Mars Science Laboratory (MSL) measured a Mars atmosphericN/N ratio of 173 ± 11 on sol 341 of the mission, agreeing with Viking's measurement of 168 ± 17. The MSL/SAM value was based on Quadrupole Mass Spectrometer measurements of an enriched atmospheric sample, with CO and HO removed. Doubly ionized nitrogen data at m/z 14 and 14.