Dechanneling ofαparticles by hydrogen atoms in palladium

Dechanneling of $\alpha$ particles by hydrogen atoms dissolved in palladium has been studied by the method of channelography. The exponential law for the variation of the dechanneling yield versus concentration of defects has been verified for the first time in a metal. A dechanneling cross section for hydrogen atoms in palladium has been deduced from the measurement and found equal to (5.7±2.6) × ${10}^{-3\mathrm{}}$ ${\mathrm{\AA }}^2$. The effect is primarily attributed to the obstruction of the channels by the protons.