The Atomic Scattering Powers of Nickel, Copper and Iron for Various Wave-Lenghts

Atomic scattering powers are measured for the atoms in metallic nickel, copper and iron when they are reflecting the $K\alpha$ lines of molybdenum, copper, nickel and iron. These data show that the scattering power of an atom passes through a minimum at its $K$ absorption limit and attains a maximum at, or near, its "resonance" wave-length. The atomic $F$-curves of the nickel atom in metallic nickel and in NiO are practically identical.