The Surface Sensitivity of MeV Ion Scattering

400 keV helium ions have been scattered in the single channeling mode from a Ni(001) surface covered with an adsorbed ordered overlayer of tellurium. The atomic surface structure of the Ni(001)-C(2 x 2)-Te system was checked by low-energy electron-diffraction (LEED) and confirmed to be that reported earlier. The channeling results however, have not at this point in time yielded atomic surface structure information which can unambiguously confirm or deny the LEED results.