- Names
-
- A. Moingeon
- E. Quirico
- O. Poch
- M. Faure
- P. Boduch
- A. Domaracka
- H. Rothard
- M. Toulemonde
- D. Bockelée-Morvan
- T. Fouchet
- F. Leblanc
- E. Lellouch
- B. Schmitt
- V. Zakharov
- Title
- A reappraisal of the amoprhization kinetics of water ice: combined experimental and numerical investigations and amorphization cross-sections in the 90-120 K range for the icy Jovian satellites
- Abstract
- Airless icy objects in the outer Solar System are continually exposed to energetic ion irradiation from the Solar wind, Solar Energetic particles, Galactic Cosmic rays or magnetospheric particles in the case of the rings or satellites of the giant planets. This irradiation can induce the amorphization of crystalline water ice, a phenomenon observed on several icy objects. However, the kinetic of water ice amorphization remains poorly constrained at temperatures above 90 K, typical of Galilean satellites. To adress this gap, new irradiation experiments were conducted using Mg, O and S ions with energies ranging from 36 to 126 keV at temperatures from 20 to 120 K. These experiments were interpreted with the numerical thermal spike model (i-TS). We demonstrate that the amorphization cross-section σ_am correlate with the electronic stopping power Se and not with the total stopping power as reported in previous studies. Parametric equations of the amorphization cross-section are provided at 90, 100 and 110 K for a range of Se values consistent with the conditions of Jovian satellites. Numerical simulations using the i-TS model confirm the key role of the electronic stopping power but fail to reproduce the evolution of the amorphization cross-section with temperature. A possible explanation lies in the mechanisms implied during the liquid-solid transformation of the ion track.
- Keywords
- spectra, water, ices, Planetary Sciences, irradiation
- Content
- spectral data, spectral data use, planetary sciences
- Document type
- article
- Publication state
- submitted