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Abstract:
A detailed examination of the influence of different parameters used in diffuse low-energy-electron-diffraction holography is presented. Effects due to the finite and discrete character of the data that are input to the method's reconstruction algorithm are investigated, as well as the influence of additional parameters introduced both for the removal of experimental Bragg-spots and for the recently proposed correction for the anisotropy of the reference wave. As a test case, we applied the reconstruction algorithm to simulated data of the disordered adsorption system O/Ni(001). Guidelines for the width and resolution of the data base to be used, as well as for the proper selection of algorithmic parameters are deduced, which should hold also for other and unknown systems of disordered atomic adsorption. Using a parameter configuration optimized according to our results, a well-resolved and fully three-dimensional image of the local adsorption geometry is reconstructed from the data.
