Geometric structure of Be(101¯0)

The structure of clean Be(101{}0) was determined by low-energy electron-diffraction (LEED) I(V) analysis and the result compared to first-principles calculations. Both theory and experiment indicate that from the two possible terminations of the truncated bulk, the one with the shorter first-interlayer spacing is realized. The values for the multilayer relaxations obtained by LEED essentially coincide with the theoretical prediction. Although the magnitude of the first- to second-layer relaxation fits well into the trend observed on other simple metal surfaces, the driving force is probably different for beryllium. {} 1996 The American Physical Society.