  The intersection between dislocations and a Ag(111) surface has been studied
using an interplay of scanning tunneling microscopy (STM) and molecular
dynamics (MD). Whereas the STM provides atomically resolved information about
the surface structure and Burgers vectors of the dislocations, the simulations
can be used to determine dislocation structure and orientation in the
near-surface region. In a similar way, the sub-surface structure of other
extended defects can be studied. The simulations show dislocations to reorient
the partials in the surface region leading to an increased splitting width at
the surface, in agreement with the STM observations. Implications for
surface-induced cross slip are discussed.
