We present highly resolved X‐ray photoemission measurements performed in order to investigate surface core level shifts (SCLS) on various different organic systems: PTCDA, coronene, and metal free phthalocyanine. C 1s spectra evidence the absence of SCLS in organic thin films. We explained these results in terms of very efficient screening. If the molecular interaction is sufficiently strong, the screening of the created charge by delocalisation is quite efficient. SCLS absence in organic materials implies that polarisation energies are much lower than usually assumed. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Maria Benedetta Casu (2007) studied this question.
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