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

Autor:	Paul Mahaffy, Richard H. Becker, Heidi L. K. Manning, Charles Malespin, Christopher P. McKay, Rafael Navarro-González, Melissa G. Trainer, Bruce M. Jakosky, Jennifer C. Stern, Heather B. Franz, Sushil K. Atreya, Pamela G. Conrad, Michael H. Wong, Tobias Owen, Andrew Steele, John H. Jones, Robert O. Pepin
Rok vydání:	2013
Předmět:	Physics Martian Analytical chemistry chemistry.chemical_element Mars Exploration Program Mass spectrometry Nitrogen Isotopes of nitrogen Astrobiology Geophysics chemistry Meteorite Sample Analysis at Mars General Earth and Planetary Sciences Quadrupole mass analyzer Regular Articles
Zdroj:	Geophysical Research Letters
ISSN:	1944-8007 0094-8276
DOI:	10.1002/2013gl057840
Popis:	[1] The Sample Analysis at Mars (SAM) instrument suite on the Mars Science Laboratory (MSL) measured a Mars atmospheric14N/15N 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 CO2 and H2O removed. Doubly ionized nitrogen data at m/z 14 and 14.5 had the highest signal/background ratio, with results confirmed by m/z 28 and 29 data. Gases in SNC meteorite glasses have been interpreted as mixtures containing a Martian atmospheric component, based partly on distinctive14N/15N and40Ar/14N ratios. Recent MSL/SAM measurements of the40Ar/14N ratio (0.51 ± 0.01) are incompatible with the Viking ratio (0.35 ± 0.08). The meteorite mixing line is more consistent with the atmospheric composition measured by Viking than by MSL.
Databáze:	OpenAIRE
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