NEAR-EDGE X-RAY ABSORPTION FINE-STRUCTURE STUDIES OF RING MOLECULES ADSORBED ON SINGLE CRYSTAL SURFACES

Near edge X-ray absorption fine structure (NEXAFS) has been used to establish the orientation of the six-membered ring molecules benzene, pyridine, pyrazine and s-triazine adsorbed on Cu and Ag single crystal surfaces. For submonolayer coverages of pyridine on Ag(111) an orientational phase transition has been observed with NEXAFS in real time