High-energy resolution La L1-edge X-ray absorption
near-edge
structure (XANES) spectra of LaAlO3 and a La-containing
cubic perovskite oxide were obtained by using the high-energy-resolution
fluorescence detection (HERFD) method. In the pre-edge region, two
new peaks, which were not observed with the conventional measurement
method, were found in the high-resolution XANES spectra and identified
as dz2 and dx2–y2 final states and dxy, dyz, and dzx final states,
respectively, from XANES simulations and theoretical investigations.