Fig. 5: Photon-energy dependence of valence-band photoelectron diffraction for Re(0001) between hν = 15 and 16 eV.

a–c Momentum distributions in the k_x − k_y plane; d–f corresponding sections of binding energy E_B vs. momentum component k_x along the dashed lines in (a–c). g–i Binding-energy profiles of the intensities in the areas marked by rectangles in (a–c). The interference condition shifts with photon energy; steps of 0.5 eV correspond to momentum steps of only 0.04 Å⁻¹ along k_z.