Influence of the core hole onKβemission following photoionization or orbital electron capture: A comparison using MnO and55Fe2

Abstract

The Mn K␤ fluorescence emission in MnO after photoionization and in 55 Fe 2 O 3 after radioactive electron capture decay from the K shell have been measured using a crystal array spectrometer with an instrumental energy bandwidth of 0.7 eV ͑full width at half maximum͒. Both compounds have a 3d 5 valence electron configuration in the ionic approximation. It is found that the spectral features after K capture in 55 Fe 2 O 3 are shifted in emission energy and are sharper, compared to the spectra following photoionization in MnO, i.e., the spectra exhibit a dependence on the mode of excitation. Crystal-field multiplet calculations including ligandto-metal charge transfer have been carried out for the 1s intermediate states as well as for the 3p to 1s (K␤) radiative transition. The populated 1s intermediate states after photoionization are found to be spread over several eV. In comparison, only the lowest-lying 1s intermediate states split by the weak (1s,3d) exchange interaction are populated after K capture. It is proposed that the differences in population of the 1s intermediate states together with a term-dependent final-state lifetime broadening can account for the changes in the spectral shapes due to the different modes of excitation.

Hard x-ray probe to study doping-dependent electron redistribution and strong covalency inLa1−xSr1+xMnOHerrero‐Martín1, Mirone2, Fernández-Rodríguez3 et al. 2010Phys. Rev. BSelf Cite284211View full textAdd to dashboardCite

“…These values were adjusted in order to fit the data. The reason of the larger width observed for the S=3/2 states resides in the fact that the 3d 3p radiative decay channel is favored by the spin alignment of the 3p hole with the 3d spin [17][18][19].…”

“…Higher energy configurations were not taken into account [17,26]. In order to separate local from non-local effects, we also did calculations for an isolated MnO 6 octahedron by removing the external orbitals.…”

A laboratory-based hard x-ray monochromator for high-resolution x-ray emission spectroscopy and x-ray absorption near edge structure measurements

“…[65][66][67][68][69][70] Laboratory-based work using SBCA's is less common, but includes comparative studies of x-ray emission from direct x-ray excitation as opposed to from Kcapture. 83,88 …”

Hole doping and pressure effects on the II-II-V-based diluted magnetic semiconductor (Ba1−xKx)

“…The KβXES is mainly composed of the strong Kβ 1,3 line and a less intense Kβ′satellite line at a lower emission energy. The 3p3d exchange interaction model [19,20] has satisfactorily explained this split structure. Kβ 1,3 line peak is slightly asymmetric with a weaker shoulder on the low energy side.…”