Quantitative Analysis of LEED Measurements

Experimental LEED intensity-energy spectra measured in our laboratory for the Al(111), Al(110), V(110), V(100), and Cu(110) surfaces are analyzed by means of r -factor comparisons with calculated spectra. The surfaces of Al(111) and V(110) are shown to correspond to nearly perfect terminations of the corresponding bulk structures. These systems are used to investigate the influence of the nonstructural variables of the calculations on the structure determination. The r -factor procedures are then applied to the determination of the surface structures of Al(110), V(100), and Cu(110). For these systems, it is found that the surface interlayer spacings exhibit a damped, oscillatory deviation from the bulk value, in qualitative agreement with the recent predictions of Landman, Hill and Mostoller ( Phys. Rev. B 21 , 448 (1980)).