Interaction of carbon monoxide with Fe(001)

Abstract

New insight into the bonding of carbon monoxide with transition-metal-surfaces is provided by spin-polarized photoemission studies of CO on Fe(001). The interaction of the molecular 5σ levels with the substrate d bands is found to be very weak for both tilted and vertical CO species. The former shows clear evidence for a π-d band interaction with discrete spin-polarized features in the occupied D band; the latter shows only small changes. Inverse photoemission studies (non-spin-polarized) indicate that the unoccupied 2π level is closer to the Fermi level for the tilted CO species.