Bond lengths and coordination numbers from L2,3-Edge versus K-Edge surface extended X-ray absorption fine structure.

The interference between final states of "s" and "d" symmetry arising from anisotropic L2,3-edge absorption is explicity considered. Previous arguments by others that such an interference can significantly affect the amplitude and phase of the L2,3- edge surface extended x-ray absorption fine structure (SEXAFS) had been based on calculated phase shifts and analysis of simulated data. Here empirical methods are developed to isolate the effects of the interference. For the case of L2,3-edge absorption from iodine it is shown that the calculated "s"- and "d"-state phase shift differences are about a factor of two larger than the experimental value.