Characteristics and exchange interactions observed in L-emission spectra of Fe, Mn and their oxides by using a high-energy-resolution soft X-ray emission spectroscopy instrument.

Abstract

For examining the characteristics of L-emission spectra of Fe, Mn and their oxides, a larger energy-dispersion spectrometer for an electron probe microanalyser was constructed. The energy resolution was evaluated to be 0.3 eV at the Fermi edge observed for the B K-emission of LaB6. The Lα,β-emission profiles and peak positions of those oxides were different from those of pure metals, reflecting the different density of states of valence bands and different charge states of metal elements. The Lℓ-emission profiles of the oxides showed shoulder structures, even though the emission is caused by transitions between two inner shell levels. The presence of the shoulder structures was assigned to the result of the 3s3d exchange interaction in the final state of the Lℓ emission, in which the 3s state has a spin. The Lℓ profiles were decomposed into two peaks by Lorentz fit, and the energy separation was evaluated to be ∼3 eV.