Discovery of a second narrow absorption feature in the near-infrared spectrum of Io

Details Discovery of a second narrow absorption feature in the near-infrared spectrum of Io Discovery of a second narrow absorption feature in the near-infrared spectrum of Io

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar...98..134l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 98, no. 1, July 1992, p. 134-140.

Computer Science

4

Absorption Spectra, Infrared Reflection, Io, Near Infrared Radiation, Planetary Composition, Spectrum Analysis, Carbon Dioxide, Hydrogen Sulfide, Sulfur Dioxides

Scientific paper

A high resolution survey of the near-IR reflectance spectrum of Io has shown a sharp absorption feature centered at 5045 +/- 1/cm; this feature is not present in laboratory spectra of dilute CO2 in a matrix. Since the spectrum of cold H2S ice crystals exhibits structure near this wavelength, it is suggested that either (1) the difference in width between this feature and that of the much broader Ionian H2S ice may be due to the presence of different phases of ice at different temperatures, so that these are emphasized in the different spectral regions, or (2) H2S is trapped in an SO2 matrix.

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