Scattering of He, Ne, Ar, H2, and N2 from Cu(110).

Abstract

Atomic-beam-scattering experiments on Cu(110) are reported for several gaseous species not reacting with the surface. Results are presented for the incoming beam impinging perpendicular to the close-packed metal rows. Diffraction features dominate for He, H/sub 2/, and Ne. The intensities of the He and H/sub 2/ diffraction beams relative to the specular are in very good agreement with the results of Salanon et al. (Surf. Sci. 127, 135 (1983)). The hard-wall corrugation amplitude perpendicular to the close-packed rows obtained by fitting the He diffraction intensities shows a continuous increase with increasing He energy in contrast to the behavior we previously observed on Ni(110). Ne diffraction exhibits pronounced rainbows at approx.20/sup 0/ from the specular showing that the corrugation amplitude seen with Ne is about twice as large as for He in complete analogy to the results previously reported on Ni(110) and Pd(110). Ar scattering shows rainbowlike features in the scattering plane with the rainbow angle smaller than in the case of Ne. N/sub 2/ scattering exhibits only broad in-plane scattering around the specular, whereas unexpected pronounced out-of-plane structure is observed.