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Infrared Spectra and Radiation Stability of H2O2 Ices Relevant to Europa

STATUS REPORT
Date Released: Thursday, June 29, 2006
 Source: Astrobiology

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Astrobiology, Jun 2006, Vol. 6, No. 3: 483-489

Full paper

In this paper we present spectra of H2O2-containing ices in the near- and mid-infrared (IR) regions. Spectral changes on warming are shown, as is a comparison of near-IR bands of H2O and H2O2-containing ices. An estimate of the A-value (absolute intensity) for the largest near- IR feature of H2O2 is given. Radiation-decay half-lives are reported for 19 K and 80 K, and are related to the surface radiation doses on Europa. The radiation data show that H2O2 destruction is slower at 80 K than 19 K, and are consistent with the claim that icy material in the outermost micrometer of Europa's surface has been heavily processed by radiation.

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