A hyperthermal hydrogen/deuterium atom beam source with a defined energy distribution has been employed to investigate the kinetically induced electron emission from noble metal surfaces. A monotonous increase in the emission yield was found for energies between 15 and 200 eV. This, along with an observed isotope effect, is described in terms of a model based on Boltzmann type electron energy distributions.
Kovacs, D. A., Babkina, T., Gans, T., Czarnetzki, U., & Diesing, D. (2006). Electronic excitation in metals through hyperthermal atoms. Journal of Physics D: Applied Physics, 39 (24)(24), 5224-5229. . https://doi.org/10.1088/0022-3727/39/24/019