Oxygen on Ganymede: laboratory studies.

@article{Vidal1997OxygenOG,
  title={Oxygen on Ganymede: laboratory studies.},
  author={R. Vidal and D. Bahr and R. Baragiola and M. Peters},
  journal={Science},
  year={1997},
  volume={276 5320},
  pages={
          1839-42
        }
}
To test proposals for the origin of oxygen absorption bands in the visible reflectance spectrum of Ganymede, the reflectance of condensed films of pure oxygen (O2) and O2-water mixtures and the evolution of O2 from the films as a function of temperature were determined. Absorption band shapes and positions for oxygen at 26 kelvin were similar to those reported for Ganymede, whereas those for the mixtures were slightly shifted. The band intensity dropped by more than two orders of magnitude when… Expand
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61 Citations
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Methods Citations
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Results Citations
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61 Citations

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Laboratory studies of the optical properties and stability of oxygen on Ganymede
We present measurements of the optical properties of solid O2 and O2:H2O films and on the stability of oxygen in water ice at different temperatures. The experiments are meant to test hypotheses for… Expand
The Geographic Distribution of Dense-phase O2 on Ganymede
Ground-based spectroscopy of Ganymede’s surface has revealed the surprising presence of dense-phase molecular oxygen (O2) via weak absorptions at visible wavelengths. To date, the state and stability… Expand
Uv-Vis, Infrared, and Mass Spectroscopy of Electron Irradiated Frozen Oxygen and Carbon Dioxide Mixtures with Water
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TLDR
The large cross-section for O2 production suggests that electronic excitation plays an important part in the formation of O2 on Ganymede and Europa, rather than by diffusion and chemical recombination of precursor fragments as has been previously thought. Expand
Photolysis of pure solid O3 and O2 films at 193 nm.
TLDR
The general good agreement of the model with the data suggests the validity of the central assumption of efficient energy and spin relaxation of photofragments in the solid prior to their reactions with other species. Expand
Laboratory studies on the formation of ozone (O3) on icy satellites and on interstellar and cometary ices
The formation of ozone (O3) in neat oxygen ices was investigated experimentally in a surface-scattering machine. At 11 K, solid oxygen was irradiated with energetic electrons; the chemical… Expand
Comment on “Laboratory studies of the optical properties and stability of oxygen on Ganymede” by Raul A. Baragiola and David A. Bahr
It has been over 15 years since Brown et al. [1982] showed that the bombardment of the icy satellites by magnetospheric plasma particles would produce significant quantities of O2, including an O2… Expand
Decomposition of solid amorphous hydrogen peroxide by ion irradiation.
TLDR
From the measurements, radiation yields are derived, which are found to be particularly high for the decomposition of hydrogen peroxide; this can be explained by the occurrence of a chemical chain reaction. Expand
A review of possible optical absorption features of oxygen molecules in the icy surfaces of outer solar system bodies
Abstract In this review we provide the data needed to interpret remote spectroscopic studies of O2 molecules embedded in the icy surfaces of outer solar system bodies. O2 produced by radiolysis has… Expand
Physical and Chemical Alterations of Ices by Fast Proton Irradiation, Particularly Ozone Synthesis
Abstract : In this thesis, we investigated the interaction of 100 keV protons with thin ice films grown under ultra-high vacuum conditions. We determined irradiation of pure water ice produced an… Expand
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