Energy loss of MeVαparticles in the palladium-hydrogen system in planar channeling

The energy loss of MeV $\alpha$ particles moving between (111) planar channels of the palladium-hydrogen system has been calculated for the case when the hydrogen-atom concentration is only a few at.% ($\alpha$ phase). The contribution due to additional electrons of hydrogen atoms is estimated by assuming that these go to the $4d$ band, and that due to protons is obtained by considering $\alpha$-particle-proton scattering. The proton contribution is found to be very small compared to that due to additional electrons for well-channeled particles, which itself is about $0.001x$ of the electronic stopping power in the (111) planar channel for pure Pd, $x$ being the atomic percentage of H in Pd.