A comparison of detailed lattice model gasndash;solid theory with molecularhyphen;beam data: Scattered velocity distributions for an Ar/W system.

摘要

Scattered velocity distributions and energy transfer results obtained from detailed lattice model calculations on the Ar/W(110) system are reported and compared to recently reported molecularhyphen;beam data using a polycrystalline W target. The computed velocity distributions are found to be in good accord with the beam data provided the results from the lattice model are averaged over scattering angle. The variation of the average energy of scattered Ar with surface temperature and incident beam energy is also correctly predicted by the lattice model. The Arndash;W binding energy obtained from recent hardhyphen;cube calculations on this sytem is in accord with that previously reported using the lattice model. If comparisons are made between the beam data and computed distributions that have not been averaged over scattering angle, the results do not agree. This is interpreted to be due to the polycrystalline nature of the surface used in the beam experiments, but it may be a result of a defect in the lattice model description of the interaction.