Photoemission study of single-crystal faces of iron

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Abstract
Energy-distribution curves (EDC's) of photoelectrons emitted normal to the surfaces of Fe(100), Fe(110), and Fe(111) have been measured using photon energies of 11.83, 16.85, and 21.22 eV. The results are interpreted by emission from electronic states of the corresponding symmetry lines in the three-dimensional Brillouin zone. The band structure of ferromagnetic Fe as computed by Singh et al. is found adequate to explain major features of the EDC's, whereas a band structure of the paramagnetic state cannot satisfactorily account for the results. The maximum of occupied states is observed at about 0.6 eV below the Fermi level in agreement with previous measurements of polycrystalline Fe films. Emission from surface states or resonances cannot be identified with certainty.