Quantum versus classical Monte Carlo simulation of low-energy electron transport in condensed amorphous media

•Quantum wave effects become non-negligible for eV electrons in molecules.•Classical Monte Carlo (MC) simulations lose validity as energy decreases.•Simplified quantum mechanical (QM) model of electron transport in water.•Errors on MC (relative to QM) increase with inelastic scatter, medium structure.•Future: develop realistic models of low energy electron transport in condensed media.