Intrinsic step-related surface states and 4f-core levels on Ir(332)

Using angle-resolved photoemission, we have identified a new surface state on Ir(332), which can be unambigously associated with step sites. This state is located near the Fermi level and can be distinguished from a terrace-related state by preferential adsorption of hydrogen on the rows of step atoms. Terrace and step atoms are shown to exhibit different 4f-core level binding energies, a fact which can be used to independently monitor preferential adsorption. © 1981.