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The adsorption geometry of perfluorinated copper-phthalocyanine molecules(F_{16}CuPc) on Cu(111) and Ag(111) is studied using X-ray standing waves. Adetailed, element-specific analysis taking into account non-dipolar correctionsto the photoelectron yield shows that on both surfaces the molecules adsorb ina lying down, but significantly distorted configuration. While on copper(silver) the central carbon rings reside 2.61 Angstroem (3.25 Angstroem) abovethe substrate, the outer fluorine atoms are located 0.27 Angstroem (0.20Angstroem) further away from the surface. This non-planar adsorption structureis discussed in terms of the outer carbon atoms in F_{16}CuPc undergoing apartial rehybridization (sp^2 --> sp^3).

physical review. b, condensed matter and materials physics

Adsorption-induced distortion of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">F</mml:mi><mml:mn>16</mml:mn></mml:msub><mml:mi>CuPc</mml:mi></mml:mrow></mml:math>on Cu(111) and Ag(111): An x-ray standing wave study

Adsorption-induced distortion ofF16CuPcon Cu(111) and Ag(111): An x-ray standing wave study