  Energy barriers for different moves of a single Rh adatom in the vicinity of
steps on Rh(111) surface are studied with molecular statics. Interatomic
interactions are modeled by the semi-empirical many-body
Rosato-Guillope-Legrand potential. We calculate systematically barriers for the
descent at straight steps, steps with the kink and small islands as well as
barriers for diffusion along the step edges. The descent is more probable on
steps with a {111} microfacet and near kinks. Diffusion along a step with a
{100} microfacet is faster than along a step with a {111} microfacet. We also
calculate barriers for diffusion on several surfaces vicinal to Rh(111).
