Surface dynamics of AlSb(110) and GaP(110)

We have investigated the lattice dynamics of the (110) surface of AlSb and GaP by employing the adiabatic bond-charge model and using the atomic geome try obtained from ab initio pseudopotential calculations. The results for b oth surfaces are in very good overall agreement with a recent high-resoluti on electron-energy-loss spectroscopy experiment and an ab initio calculatio n. The differences between the dynamical properties of these surfaces are c orrelated to the cation/anion mass ratios. (C) 1999 Elsevier Science B.V. A il rights reserved.