Hi Matt,

Personally, I'd like to see more data with clear MEE to play with, and would like to model these better than with an ad hoc arc-tanget. I'd also like to see a real case where including MEE transitions gave different structural results than an analysis that did not include them. Any takers?

I've chosen three real chemical problems from our work where multielectron excitations had to be taken into account in order to obtain structural information. I'm sending you original data together with our articles: - cetyl-trimethylammonium bromide (CTAB) adsorbed on carbon black with very weak structural signal (Br_CTAB.nor, Br-O bond). Spectrum of aqueous solution of KBr (Br_sol.nor) helped to separate atomic and structural features. Article: Kodre, A., Padeznik Gomilsek, J., Arcon, I., Preseren, R., Separation of weak EXAFS signal from atomic background in Br and Rb samples. J. synchrotron radiat., 1999, vol. 6, 306-307. - iodine in electrolyte, again weak EXAFS signal (I_MPE.mue, I-I bond). Due to simplicity of EXAFS signal we used shorter k-range to avoid distortion from MPE. Article: Padeznik Gomilsek, J., Arcon, I., Kodre, A. Atomic effects in EXAFS structural analysis of redox I[sup]-/I[sup]-[sub]3 solid state electrolites. Acta chim. slov.. 2006, 53, 18-22. Available online: http://acta.chem-soc.si/issues.html - CeO2 thin films annealed in air (Ce_air.mue) or Ar (Ce_Ar.mue). I'm sending a spectrum of CeO2 powder as well (CeO2.mue). As in some other lanthanides, MPE signal is very strong and affects structural analysis even in case of CeO2 powder. We subtracted (valence dependent) MPE estimate prior to EXAFS analysis. In this case MPE resonances are more important than arc-tanget. Article: Padeznik Gomilsek, J., Kodre, A., Bukovec, N., Kozjek-Skofic, I. Atomic effects in EXAFS structural analysis of mixed Ce oxide thin films. Acta chim. slov., 2004, 51, 23-32. Available online: http://acta.chem-soc.si/issues.html Best regards, Jana