He diffraction studies of Pt(110) (1 × 2)

Results are presented on the diffraction of 4He atoms from the 1×2 reconstructed surface of Pt(110). The diffraction pattern observed indicates that the surface can be considered to have a one-dimensional corrugation. From the position of the rainbow maximum the corrugation amplitude is estimated to be ∼1.5 Å. Structural models for the surface are used to derive corrugation funtions from the superposition of atomic charge densities. The results of hard wall scattering calculations from these large corrugations are compared with the experimental data. The results confirm that the large corrugation amplitude could arise from a displaced or missing row model. However, limitations in the present analytical theory prevent any definite distinction to be made concerning the detailed nature of the atomic displacements. These limitations are discussed in the light of the present results and previously published data. © 1983.