Evidence for a telluric value of the C-12/C-13 ratio in the atmospheres of Jupiter and Saturn

Details Evidence for a telluric value of the C-12/C-13 ratio in the atmospheres of Jupiter and Saturn Evidence for a telluric value of the C-12/C-13 ratio in the atmospheres of Jupiter and Saturn

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..531c&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 4, Nov. 1977, p. 531-537.

Astronomy and Astrophysics

Astrophysics

19

Carbon Isotopes, Chemical Evolution, Jupiter Atmosphere, Saturn Atmosphere, Abundance, Atmospheric Composition, Geochemistry, Mass Ratios, Methane, Spectral Bands

Scientific paper

A determination of the C-12/C-13 isotopic ratio in the atmospheres of Jupiter and Saturn has been derived from several manifolds of the (C-13)H4 nu(3) band. A careful elimination of faint extraneous lines of (C-12)H4 has been made using highly resolved laboratory spectra obtained at temperatures and pressures close to the planetary conditions. It is shown that the (C-13)H4 and (C-12)H4 3 nu(3) bands cannot be significantly compared in terms of a reflecting-layer model. A method for comparing the (C-13)H4 3 nu(3) lines with weak (C-12)H4 lines in terms of a scattering atmosphere is described which is valid for any scattering process. For both Jupiter and Saturn, the resulting C-12/C-13 ratio does not differ significantly from the telluric value. The results are a C-12/C-13 ratio of 89 (+12, -10) for Jupiter and 89 (+25, -18) for Saturn.

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