Photolysis and Radiolysis on the Surface of the Icy Satellites

Details Photolysis and Radiolysis on the Surface of the Icy Satellites Photolysis and Radiolysis on the Surface of the Icy Satellites

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0411j&link_type=abstract

American Astronomical Society, DPS meeting #28, #04.11; Bulletin of the American Astronomical Society, Vol. 28, p.1072

Astronomy and Astrophysics

Astronomy

1

Scientific paper

In this paper the available laboratory data on photolysis and radiolysis of ice is summarized for the purpose of interpreting remote sensing data on the icy satellites. It is pointed out that the dominant species seen in laboratory spectra can differ from those seen in space but in regions with temperatures always < 100 K the band at 0.28 mu m, associated with trapped OH as well as bands (< 0.25 mu m) associated with HO2 and H2O2 will produce a general reddening below ~ 0.4 mu m and may be detectable. In addition, the luminescence produced by plasma bombardment may be observable by spacecraft on the night-side of certain icy satellites [1]. The energetic incident ions also produce vacancies and intersitials which migrate under annealing to form clusters of vacancies, called voids, and to form molecules. The H2 and O2 molecules formed at a defect or at a surface, from diffusing O and H interstitials, can either escape at the vacuum interface in the porous regolith or become trapped in the voids forming bubbles. The bubbles will form preferentially at interfaces in a ``dirty'' ice and will predominantly contain O2 [2], which diffuses through ice much less efficiently than H2. Photolysis in such a micro-O2 atmosphere leads to formation of O3 [3]. Introducing the interaction of O((1) D) with O3 into the Chapman equations gives a ratio O3/O2 of ~ 2 x 10(-4) , close to the ratio estimated by Noll et al. [4] from HST observations. [1] R.E. Johnson and T.I. Quickenden (1996). Submitted for publication. [2] Calvin et al., (1996). Geophys. Res. Lett. 23, 673. [3] R.E. Johnson and W.A. Jesser (1996). Submitted for publication. [4] Noll et al., (1996). Science 273, 341.

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