X-ray absorption fine structure above the TiLedge

Abstract

We report the first measurement of an EXAFS signal from an $L$ edge in the intermediate-energy range 200-1000 eV, obtained using synchrotron radiation and by the use of a specially designed multielement detector system. Observations of the near-edge absorption fine structure show the hole-state spin-orbit splitting and give clear evidence that the Ti $L$ edge exhibits a "white line." In addition, pronounced oscillations were observed in the absorption spectrum, extending at least 350 eV above the edge. Three peaks were observed in the Fourier-transform signal, corresponding to first-, second-, and fourth-neighbor distances. Derived phase shifts were consistent with a predominant $d$-wave character in the continuum final state.