Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p52c..07o&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P52C-07
Physics
2732 Magnetosphere Interactions With Satellites And Rings, 2784 Solar Wind/Magnetosphere Interactions, 5719 Interactions With Particles And Fields, 6020 Ice, 6220 Jupiter
Scientific paper
This talk will present an overview of the non-thermal processes involved in the electron- and vacuum ultraviolet (VUV) photon-induced transformation of outer solar system surfaces. An emphasis will be made on i.) Understanding the initial electronic states created during electron impact and VUV photon absorption, ii.) The subsequent energy partitioning and release of excited fragments, iii.) The reactive scattering of atomic and molecular fragments and iv.) The trapping of products. Experiments are carried out using ultrahigh vacuum surface science techniques to achieve the very low vacuum and low temperatures typical of the outer solar system. The use of tunable excitation sources, quadrupole and time-of-flight mass spectrometry and Fourier transform infrared spectroscopy allows the determination of product branching ratios and absolute cross sections as a function of energy. The specific systems discussed will be pure and mixed (CO2:H2O) low-temperature ices, frozen sulfuric acid hydrates and flash-frozen sodium and magnesium sulfate brines. The mixed ices are simple models of comets and icy grain surfaces, whereas the latter are reasonable surrogates for the non-ice material(s) present on Europa. The talk should clearly indicate the important role electronic transitions play in chemically altering surfaces present in regions within the solar system that contain magnetospheres.
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