Angle-resolved-photoemission study of the Cr(100) surface

Normal and off-normal angle-resolved-photoemission data for Cr(100) are reported. Assuming a free-electron-like final-state band, bulk energy-band dispersions along the Γ-Δ-H, H-G-N, and N-D-P symmetry lines are determined. Measured critical-point binding energies are 0.95 (Γ₂₅^'), 2.0 (N₂,P₄), 3.40 (H₁₂), and 4.0 eV (N₁). Standard self-consistent band-structure calculations predict larger d-band widths than those measured (typically by 20% at N₂). Evidence for a prominent surface state with a binding energy of 0.65 eV at the Γ point of the surface Brillouin zone is found for clean Cr(100).