PROPERTIES OF NONSPECULAR LOW-ENERGY ELECTRON DIFFRACTION BEAMS SCATTERED BY (100) FACE OF FACE-CENTERED-CUBIC METAL SINGLE CRYSTALS

The intensities of the nonspecular low-energy electron beams diffracted from the Al (100) and Pd (100) surfaces were measured as a function of electron energy in the range 5-200 eV at room temperature. The experimental results were correlated with Ihk-eV curves which were obtained from Ni(100), Cu(100), Ag(100), and Au(100) surfaces. Single- and double-diffraction conditions were adequate to compute the positions of most of the maxima. The double-diffraction condition 2Kz=Gz appears to be especially important at low electron energies. The intensities and shapes of the diffraction peaks are strongly influenced by the atomic potential. © 1969 The American Physical Society.