Cosmic-ray sputtering of interstellar ices in the electronic regime A compendium of selected literature yields

Aims. With this article, we aim to provide the sputtering yields for molecular species of potential astrophysical interest and in the electronic regime of interaction characteristic of cosmic rays. We specifically target molecules that are constitutive of interstellar ice mantles.Methods. We used a compendium of existing data on electronic sputtering to calculate the prefactors leading to the generalisation of the stopping-power-dependent sputtering yield for many species condensing at low temperature. In addition, we present new experimental results to constrain the yield for solid CH4, C-6, and CH3CN.Results. Electronic sputtering is constrained using literature data for H-2, HD, D-2, Ne, N-2, CO, Ar, O-2, Kr, Xe, CO2, SO2, NH3, S, H2O, D2O, CH3OH, Leucine, C20H12, C24H12, and C-60. A first-order relation with the sublimation enthalpy is derived, which allows us to predict the sputtering yield within an order of magnitude for most species. The fluctuations around the mean are partly assignable to the differences in resilience towards radiolysis for individual species, and partly to the micro-physics details of the energy transfer to the lattice.

Automated summary

This article aims to provide the sputtering yields for molecular species of potential astrophysical interest in the electronic regime of interaction characteristic of cosmic rays. The authors used a compendium of existing data on electronic sputtering to calculate the prefactors leading to the generalization of the stopping-power-dependent sputtering yield for many species. They also presented new experimental results to constrain the yield for specific molecules.