The AU surface density of states and surface core level shifts in Cu(3)Au(001).

We have separated The Au surface density of states in Cu(3)Au (001) from the Au bulk states and find that the bottom of the Au 5d band is shifted up to lower binding energy, similar to the 5d-band shift previously observed at the surface of pure Au. This suggests a similar origin in Cu(3)Au and in Au for the Au surface-atom core level shifts, which have the same sign and comparable magnitude in both materials.