Measurements have been made of the emission of both positive and negative particles from solid hydrogen and deuterium for normal incidence of H+, H2+, H+3, D2H+, D3+ and He+ ions up to 10 keV. For positive particles the emission coefficient increased with increasing energy of incidence to reach a value of 0.08 per atom for 10 keV H+ onto hydrogen. Apparently the positive particles are sputtered ones. The negative particles emitted are predominantly electrons. The emission coefficient per incident atom as a function of the velocity of the incident particle agrees fairly well with results published earlier for incidence of hydrogen and deuterium ions. However, systematic differences of up to 10% are now observed between the coefficients for the different types of ions.
Børgesen, P., Schou, J., & Sørensen, H. (1980). Ion-Induced Emission of Charged Particles from Solid Hydrogen and Deuterium. Journal of Nuclear Materials, 93-94(part 2), 701-703. https://doi.org/10.1016/0022-3115(80)90195-6