Abstract
Spatially resolved infrared and ultraviolet wavelength spectra of
Europa's Leading, anti-jovian quadrant observed from the Galileo
spacecraft show absorption features resulting from hydrogen peroxide.
Comparisons with laboratory measurements indicate surface hydrogen
peroxide concentrations of about 0.13 percent, by number, relative
to water ice. The inferred abundance is consistent with radiolytic
production of hydrogen peroxide by intense energetic particle bombardment
and demonstrates that Europa's surface chemistry is dominated by
radiolysis.
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