Angular-dependent x-ray-photoelectron peak intensities from single-crystal gold

Detailed measurements of the angular distributions of x-ray-photoelectron intensities from a gold single crystal are reported. The energy-integrated $4d$-,$4f$-, and valence-peak intensities exhibit essentially identical angular distributions consistent with the near equality of their corresponding photoelectron de Broglie wavelengths. A $4f$ intensity contour plot over the full $2\pi$ solid angle is found to agree very well with the qualitative predictions of Kikuchi-band theory. The relationship of such effects to angular-dependent changes in valence-spectrum fine structure observed previously is also discussed.