Secondary electron emission from solid HD and a solid H₂-D₂ mixture

Secondary electron emission from solid HD and a solid 0.6 H₂ + 0.4 D₂ mixture has been studied for electron and hydrogen ion bombardment at primary energies from 0.5 to 3 keV and 2 to 10 keV/amu, respectively. The yield for solid HD is well explained by a simple stoichiometric model of the low-energy stopping power for the internal secondaries. The secondary electron yield from the mixture is somewhat larger than the expected value, but lies between the values for pure solid H₂ and D₂. The secondary electron emission coefficient for solid tritium may be determined from a linear extrapolation of the present data.