Abstract
He atomic beam scattering has revealed the morphology of a thin Ba layer on a LiF(001) surface. The Ba atoms randomly deposited on a LiF(001) surface followed by subsequent annealing form an atomically flat atomic-order layer. The layer does not reflect the periodic structure of the substrate. Flatness of the layer before and after annealing is evaluated using the hard cube model with surface roughness parameters. Prolonged annealing causes Ba atoms to react with the substrate and roughens the surface. The structure of the reaction product measured by He atomic beam diffraction shows periodicity twice as large as that of the substrate.
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