TI-2P AND O-1S X-RAY-ABSORPTION OF TIO2 POLYMORPHS

We present and discuss the Ti 2p and O 1s X-ray absorption spectra (XA S) and resonant photoelectron emission spectra (RPES) of the various p olymorphic forms (TiO2-II, rutile and anatase) of TiO2. The largest di fferences between the Ti 2p XAS of polymorphs of TiO2 are observed in the region of the double peak structure of the L-3 edge. A strong delo calization of the excited 3d electron in this region is concluded from the RPES at the L-3 threshold of Ti. The differences in XAS are attri buted to increasing strength of the crystal field caused by delocaliza tion of the excited 3d electron. (C) 1997 Elsevier Science Ltd.