Oxygen on Ganymede: laboratory studies.
@article{Vidal1997OxygenOG, title={Oxygen on Ganymede: laboratory studies.}, author={Ricardo Alberto Vidal and David A. Bahr and Ra{\'u}l A. 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…
64 Citations
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References
SHOWING 1-10 OF 44 REFERENCES
O2 on Ganymede: Spectral characteristics and plasma formation mechanisms
- Physics
- 1996
Weak absorption features in the visible reflectance spectrum of Jupiter's satellite Ganymede have been correlated to those observed in the spectrum of molecular oxygen. We examine the spectral…
Detection of Ozone on Ganymede
- PhysicsScience
- 1996
An absorption band at 260 nanometers on the trailing hemisphere of Ganymede, identified as the Hartley band of ozone (O3), was measured with the Hubble Space Telescope, and apparently this O2-O3 “atmosphere” is trapped in GanyMede's surface ice, an inference consistent with the shift and broadening of the band.
Charge‐coupled device spectra of the Galilean satellites: Molecular oxygen on Ganymede
- Physics
- 1995
We have obtained 3200–7800 A CCD spectra of the Galilean satellites at a variety of orbital longitudes, with spectral resolution between 3 and 18 A and signal-to-noise ratios of up to 2000 at 6000 A.…
Ganymede, Europa, Callisto, and Saturn's rings: Compositional analysis from reflectance spectroscopy☆
- Physics, Geology
- 1980
Alteration of the UV-visible reflectance spectra of H2O ice by ion bombardment
- Physics
- 1991
Abstrac%. Satellites in the Jovian and temperature was measured by a cryodiode; the Saturnian system exhibit differences in measurement proved to be accurate to about 1 K by reflectivity between…
Absorption measurements of oxygen between 330 and 1140 nm
- Chemistry
- 1990
The absorption spectrum of O2 and O2-O2 collision pairs were measured over the wavelength range from 330 to 1140 nm using pressures of O2 from 1 to 55 atm at 298 K. Absorption cross sections,…
Sublimation of vapor-deposited water ice below 170 K, and its dependence on growth conditions.
- PhysicsPhysical review. B, Condensed matter
- 1993
It is found that fresh films have an enhanced sublimation rate, which decays in time and which depends on film thickness and growth temperatures, and this is attributed to sublimating from regions containing amorphous ice, which transforms with time into the less volatile crystalline ice.
Astrophysical implications of amorphous ice—a microporous solid
- PhysicsNature
- 1986
Since the observation of the 3-µm band in interstellar infrared sources1–3, vapour-deposited amorphous ice, H2O(as), has been discussed as a major component of comets4–9, of satellites of the outer…
Structural transitions in amorphous water ice and astrophysical implications.
- PhysicsScience
- 1994
The structural transition from Iah to Ial is responsible for the diffusion and recombination of radicals in ultraviolet-photolyzed interstellar ices at low temperatures and can be used to explain hitherto anomalous properties of astrophysical ices.