Modeling of sputtering of the ice surfaces under impact of H+ ions: Redistribution of the h and o isotopes applied to the satellites of Jupiter

摘要: Using computer modeling, the current models for sputtering coefficient calculation of ice surfaces under impact H+ ions are statistically analyzed and coefficients their confidence intervals calculated over a wide range ion energies. It was established that approximation model (Fama et al., 2008) with interval ±20% is less sensitive to variable parameters. The water p = 0.94, T 80 K) energies from several eV 10 keV results verified experimental data. maximum 0.9 H2O/ion at energy incident 200 eV. modeling dependence H2O molecules surface temperature showed they weakly vary in 40–100 K increase an temperature. At distribution K, Y(E eV) — 1.1 H2O/ion. by kinetic dispersed H O atoms modeled 1–100 ions. These may be applied isotopic compositions exosphere Jupiter’s satellites course sputtering. ratios H, D, 18O, 16O (Europe, Ganymede, Callisto) (1.7 ± 0.3) × 10−5 0.18 0.03, respectively. distinct initial isotope on satellites. This significant difference lead redistribution isotopes variation D/H ratio depends flux density radiated