Abstract
Site-specific core hole screening effects at organic/metal interfaces were studied using core-level X-ray photoemission spectroscopy (XPS), X-ray excited Auger electron spectroscopy (XAES), and valence band ultraviolet photoemission spectroscopy (UPS). As model molecules, we chose zinc phthalocyanine (ZnPc) and its perfluorinated derivative ZnPcF16 evaporated on Au(100). For the first molecular layer on the metal surface, we observe for both molecules a clear splitting of the Zn L3M4,5M4,5 signal due to strongly increased screening in the double-hole final states. In contrast, F KL2,3L2,3 Auger spectra do not show additional features at any stage of deposition. Site-dependent screening effects are discussed in terms of polarization and charge-transfer screening.
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