New upper limits for atmospheric constituents on Io

Details New upper limits for atmospheric constituents on Io New upper limits for atmospheric constituents on Io

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...27..439f&link_type=abstract

Icarus, vol. 27, Mar. 1976, p. 439-446.

Computer Science

9

Atmospheric Composition, Io, Molecular Spectra, Absorption Spectra, Ammonia, Emission Spectra, Helium, Hydrogen Sulfide, Methane, Nitrous Oxides

Scientific paper

A spectrum of Io from 0.86 to 2.7 microns with a resolution of 3.36 per cm and a signal to rms noise ratio of 120 is presented. No absorptions due to any atmospheric constituents on Io could be found in the spectrum. Upper limits of 0.12 cm-atm for NH3, 0.12 cm-atm for CH4, 0.4 cm-atm for N2O, and 24 cm-atm for H2S were determined. Laboratory spectra of ammonia frosts as a function of temperature were compared with the spectrum of Io and showed this frost not to be present at the surface of Io. A search for possible resonance lines of carbon, silicon, and sulfur, as well as the 1.08-micron line of helium, proved negative. Upper emission limits of 60, 18, 27, and 60 kilorayleighs, respectively, were established for these lines.

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