  The vacuum expectation value of the surface energy-momentum tensor is
evaluated for a massless scalar field obeying mixed boundary condition on an
infinite plate moving by uniform proper acceleration through the
Fulling-Rindler vacuum. The generalized zeta function technique is used, in
combination with the contour integral representation. The surface energies for
separate regions on the left and on the right of the plate contain pole and
finite contributions. Analytic expressions for both these contributions are
derived. For a minimally coupled scalar the surface energy-momentum tensor
induced by vacuum quantum effects corresponds to a source of the cosmological
constant type located on the plate and with the cosmological constant
determined by the proper acceleration of the plate.
