Ion-induced emission of charged particles from solid hydrogen and deuterium

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.