  Using a recent continuum model of a single-crystal nanowire morphological
evolution in the applied axial electric field, an axisymmetric evolution of a
microscopically rough nanowire surface is computed. Morphological evolution
results in a wire breakup into a cylindrical segments (particles). Breakup time
and the number of particles are characterized for various levels of the radial
and axial surface roughness. It is shown that electromigration and larger
surface roughness lead to a shorter breakup time and the increased number of
particles.
