Abstract
The presence of the surface causes circular dichroic effects in angular resolved photoemission (CDAD) from electronic states of adsorbates with a spherical symmetric charge distribution. A simple reflection mechanism is introduced to the atomic theory of the angular resolved photoemission from adsorbates excited by polarised light. This model is further refined by including electron diffraction. From both models it is found that interferences of partial waves of the same orbital quantum number cause a new class of CDAD effects. The interference is due to the difference in the path length of the direct and the reflected wave and to the scattering phaseshift. In comparison to experiments from NO adsorbed at Pt(111) it is shown that the CDAD provides to distinguish between different adsorbate geometries.
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