Electron and proton elastic scattering in water vapour

In the present work, we report theoretical differential and integrated cross sections of the elastic scattering process for sub-thermalization electrons (Einc ≅ 10 meV–10 keV) and 1 keV–1 MeV protons in water vapour. The calculations are performed within the quantum mechanical framework for electrons whereas classical calculations are provided for protons. The results obtained in this free-parameter theoretical treatment are compared to available data and quantitative differences are reported.