Non-linear Radiolysis: The case of Electronic Sputtering of Solid Oxygen

Details Non-linear Radiolysis: The case of Electronic Sputtering of Solid Oxygen Non-linear Radiolysis: The case of Electronic Sputtering of Solid Oxygen

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p21a..04f&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P21A-04

Physics

6022 Impact Phenomena (5420, 8136), 6060 Radiation And Chemistry, 6218 Jovian Satellites, 6280 Saturnian Satellites, 2732 Magnetosphere Interactions With Satellites And Rings

Scientific paper

Electronic sputtering of molecular solids occurs on icy surfaces in the outer solar system due to irradiation by energetic ions mainly from magnetosphere plasmas. For ice water it has been found that the electronic sputtering yield Y (molecules ejected per projectile) does not depend linearly on the electronic stopping power (Se) of the projectile, and is double valued (forming a loop where, for the same Se, Y is higher at low than at high projectile velocities). Solid oxygen has been discovered on the surfaces of icy satellites in the outer solar system and is considered a precursor for the formation of ozone due to ion bombardment. We find that the electronic sputtering yield of solid oxygen also shows a non-linear dependence on Se, which has been described as a transition between linear and quadratic with increasing Se. Here we present experimental results of sputtering yields of solid oxygen for 25-240 keV protons that indicate that previous discrepancies between keV and MeV data are due to Y(Se) being double-valued. In this work, we propose that the electronic sputtering yield at low velocities is mainly dominated by the coulomb repulsion energy deposited near the surface and enhanced by the electron capture mechanism. The results show that radiation effects by ions cannot be estimated from studies with low energy electrons, as often assumed, and suggest that the common description of radiation effects in terms of energy deposited per molecule is incomplete.

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