Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p51a1391w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P51A-1391
Physics
0343 Planetary Atmospheres (5210, 5405, 5704), 0394 Instruments And Techniques, 0424 Biosignatures And Proxies, 0454 Isotopic Composition And Chemistry (1041, 4870), 9805 Instruments Useful In Three Or More Fields
Scientific paper
The Tunable Laser Spectrometer (TLS) in one of three instruments (QMS, GC, TLS) that make up the Sample Analysis at Mars (SAM) analytical chemistry lab on NASA's 2009 Mars Science Laboratory (MSL) mission. TLS has unprecedented capability for measuring methane, water, and carbon dioxide abundances in the Martian atmosphere and evolved from heated soil samples. In addition, TLS will measure the 13C/12C isotope ratios in both CH4 and CO2, and the 16O/17O/18O isotope ratios in CO2. Using an interband-cascade and a tunable diode laser, TLS has capability to determine atmospheric methane abundance to 2 percent accuracy and to a lower limit of 1 part-per-trillion with SAM pre- concentration. The instrument and recent test data results will be described in context with the needs for understanding Martian atmospheric and geophysical processes.
Mahaffy Paul R.
Webster Christopher R.
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