Structure and dynamics of the Al(110) surface

The temperature dependence of the surface structure and vibrational amplitu des of Al atoms in the first four layers of the Al(110) surface has been de termined by the analysis of low-energy electron-diffraction measurements at 100 and 300 K. The surface exhibits oscillatory, multilayer relaxations of size Delta d(12)= -8.1%, Delta d(23)= + 5.5%, Delta d(34)= - 3.8% at 100 K and Delta d(12)= - 11.1%, Delta d(23)= + 6.7%, Delta d(34)= - 4.0% at 300 K. Large enhancements of vibrational amplitudes are found for Al atoms in t he first three layers at both temperatures. At 300 K, second-layer Al atoms have larger vibrational amplitudes than first-layer atoms. Comparison is m ade to the recent calculations of Marzari et al.