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We have performed angle-dependent near-edge x-ray absorption fine structuremeasurements in the Auger electron yield mode on the correlatedquasi-one-dimensional organic conductor TTF-TCNQ in order to determine theorientation of the molecules in the topmost surface layer. We find that thetilt angles of the molecules with respect to the one-dimensional axis areessentially the same as in the bulk. Thus we can rule out surface relaxation asthe origin of the renormalized band widths which were inferred from theanalysis of photoemission data within the one-dimensional Hubbard model.Thereby recent theoretical results are corroborated which invoke long-rangeCoulomb repulsion as alternative explanation to understand the spectraldispersions of TTF-TCNQ quantitatively within an extended Hubbard model.

Are the renormalized band widths in TTF-TCNQ of structural or electronic origin? - An angular dependent NEXAFS study