X-RAY-ABSORPTION NEAR-EDGE SPECTROSCOPY (XANES) STUDY OF THERMOSTABLEPOLYPHENYLQUINOXALINE (PPQ) POLYMER PRIOR TO CU THIN-FILMS DEPOSITION

We have studied the properties of untreated and O-2 (or N-2) plasma tr eated polyphenylquinoxaline (PPQ) polymer surfaces by X-ray absorption near edge spectroscopy (XANES). Upon comparing, with our previous XPS results, the measurements performed at the C and N-K edges under norm al or glancing incidences, it is clear that XANES provides new informa tion on the electronic properties and on the preferential orientation of the spin coated polymer film. It is shown, in particular, that the plasma treatment strongly modifies the antibonding pi(ring)() and pi( C-H)() resonances.