Physics – Optics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apopt..44.1226w&link_type=abstract
Applied Optics IP, vol. 44, Issue 7, pp.1226-1235
Physics
Optics
15
Scientific paper
In light of the recent discovery of methane on Mars and its possible biological origin, a strategy is described for making in situ measurements of methane and its isotopes on the surface of Mars by laser spectroscopy in the 3.3-µm wavelength region. An instrument of reasonable mass (~1 lb) and power (few watts) is capable of measuring mixing ratios down to 0.1 part per 10^9 by volume, a hundred times lower than recently reported observations. Making accurate measurements of 13CH4 and CH3D will be more difficult. For measuring delta13C to 10 per mille and delta D to 50 per mille, sample preconcentration will be required to ~3 parts per 10^6 by volume for delta13C and to ~40 parts per 10^6 by volume for delta D. This need would be mitigated by the discovery of larger local abundances of methane near the source regions.
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