SAMPLING OF DIFFUSE LEED INTENSITY DISTRIBUTIONS BY CONVENTIONAL SPOTINTENSITIES

Recent developments to reconstruct real space atomic images from diffu se LEED intensities generated by disordered adsorbates ask for data at higher electron energies in order to improve resolution. However, at energies above approximately 500 eV increasing thermal diffuse and Kik uchi scattering as well as crowding of substrate spots make the direct measurement of such data practically impossible. Therefore, we descri be a new procedure to measure diffuse intensity distributions: we show both experimentally and theoretically that conventional superstructur e spots of ordered adsorbates sample the diffuse distribution when the local adsorption geometry is the same. So, diffuse intensity distribu tions can be obtained by conventional spot measurements. Diffuse patte rns resulting from this sampling procedure may be input to holographic reconstruction techniques particularly when data of different energie s are needed.