J. Phys. IV France 7 (1997) C2-247-C2-248
Glancing Angle EXAFS of Ultra Thin Films : Negligible Anomalous Dispersion EffectsD.T. Jiang and E.D. Crozier
Department of Physics, Simon Fraser University, Burnaby, BC Canada V5A 1S6
Anomalous dispersion effects distort the EXAFS interference functions obtained at glancing angles of incidence. It is shown that the distortions in the amplitude and phase shift are strongly dependent on the thickness of the sample layer in a multilayer system. For thick films (several hundred Å or more) our results are in good agreement with previous results in the literature. For ultrathin samples (several atomic layers thick) we show that the distortions become negligibly small. Our calculations are confirmed with experiment for a 8 monolayer bet Cu film grown on a Ag(00l) substrate.
© EDP Sciences 1997