Hydrogen peroxide production via electron bombardment on Europa: Laboratory studies

Details Hydrogen peroxide production via electron bombardment on Europa: Laboratory studies Hydrogen peroxide production via electron bombardment on Europa: Laboratory studies

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.5818h&link_type=abstract

American Astronomical Society, DPS meeting #37, #58.18; Bulletin of the American Astronomical Society, Vol. 37, p.1572

Biology

Scientific paper

Chemistry on the icy surface of Europa is heavily influenced by the 7.9e10 keV cm-2 s-1 incident particle flux resulting from the Jovian magnetic field. The majority (> 75%) of this energy is in the form of high energy (< 10 MeV) electrons.
We have constructed a 1e-8 torr vacuum chamber equipped with a 100 keV electron gun and He-compressor cryostat in order to simulate the electron irradiation environment of Europa. Pure water films of approximately two micron thickness were grown at 100K and then either cooled (to 80K), warmed (to 120K) or left at 100K and subsequently irradiated with 10 keV electrons. Beam current was adjusted to fall between 0.1-5 microAmp based on the desired energy deposition rate.
The production of hydrogen peroxide (H2O2) was monitored by observation of the 2850 cm-1 (3.5 micron) band. Production levels were found to lie within the range of 0.1% to 0.3% hydrogen peroxide by number relative to water. This is comparable to surface abundance measurements for peroxide on the surface of Europa (0.13%).
This research is supported by the NASA Exobiology program and by the NASA Graduate Student Fellowship Program.

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