A method is introduced joining together forward-scattering diffraction data taken in a small angular window at different photoelectron energies. This method extends the usable range in phase space for three-dimensional image reconstruction. Examples based on theoretical simulations demonstrate that a spatial resolution of ≤1 Å is achievable. We also show that using a small angular window in the backscattering geometry eliminates splittings in the reconstructed image.

• Received 13 December 1990

DOI:https://doi.org/10.1103/PhysRevLett.67.3102