Author/Authors :
Schnadt، نويسنده , , J and Schiessling، نويسنده , , J and O’Shea، نويسنده , , J.N and Gray، نويسنده , , S.M and Patthey، نويسنده , , L and Johansson، نويسنده , , M.K.-J and Shi، نويسنده , , M and Krempask?، نويسنده , , Matti ahlund، نويسنده , , J and Karlsson، نويسنده , , P.G and Persson، نويسنده , , P and M?rtensson، نويسنده , , N and Brühwiler، نويسنده , , P.A، نويسنده ,
Abstract :
X-ray absorption spectroscopy (XAS) and scanning tunneling microscopy (STM) have been used to study the absorption of monolayers of the pyridinecarboxylic acid monomers (isonicotinic acid, nicotinic acid, and picolinic acid) and benzoic acid on a rutile TiO2(1 1 0) surface. We find that the pyridine and phenyl rings are oriented with their planes largely perpendicular to the surface. The azimuthal orientations are strongly influenced by adsorbate–adsorbate interactions, which in each case leads to at least two different molecular species. In order to reach this conclusion a detailed strategy has been developed for the interpretation of angle-dependent XAS data, which does not rely on any curve fitting procedures.
Keywords :
Aromatics , Titanium oxide , Single crystal surfaces , X-ray absorption spectroscopy , Evaporation and sublimation , Scanning tunneling microscopy , Chemisorption
