  The lack of accurate low-energy electron scattering cross sections for liquid
water is a substantial source of uncertainty in the modelling of radiation
chemistry and biology. The use of existing amorphous ice scattering cross
sections for lack of liquid data has been discussed controversially over
decades. Here, we compare experimental photoemission data of liquid water with
corresponding predictions using amorphous ice cross sections, with the aim of
resolving the debate regarding the difference of electron scattering in liquid
water and amorphous ice. We find very similar scattering properties in the
liquid and the ice for electron kinetic energies up to a few hundred electron
volts. The scattering cross sections recommended here for liquid water are an
extension of the amorphous ice cross sections. Within the framework of
currently available experimental data, our work answers one of the most debated
questions regarding electron scattering in liquid water.
