ELECTRON ENERGY-LESS FINE-STRUCTURE OF A POLYCRYSTALLINE TITANIUM SURFACE

The temperature dependence of the electron energy-loss fine structure (EELFS) of a polycrystalline titanium surface has been measured in ref lection mode for electron beams at different incidence angles to the n ormal of the surface. We have found that within experimental error (ab out 0.06 Angstrom) the interatomic distance between titanium atoms rem ains unchanged as the depth from the surface changes and that the EELF S Debye-Waller factor has larger values for larger incidence angles. T his result is compared with the reported results of LEED measurements.