d-d Excitations in Transition-Metal Oxides: A Spin-Polarized by Bärbel Fromme

By Bärbel Fromme

During this monograph, investigations of the digital constructions of the transition-metal oxides MnO, CoO, and NiO with spin-polarized electron energy-loss spectroscopy are awarded and in comparison with different experimental and theoretical effects. After a assessment of the current wisdom of the digital constitution of the monoxides, the spectroscopic procedure utilized and its designated benefits are defined. the information and use of the various spin, perspective, and primary-energy dependences of some of the correct inelastic electron-scattering mechanisms supply new insights into the excitation approaches of the optically forbidden transitions among the crystal-field-split 3d states of the majority and of the skin.

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Extra resources for d-d Excitations in Transition-Metal Oxides: A Spin-Polarized Electron Energy-Loss Spectroscopy (SPEELS) Study (Springer Tracts in Modern Physics)

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In this method, advantage is taken of the possibility of excitation by electron impact: incident electrons of fixed primary energy are inelastically scattered at the target, and the energy distribution of the scattered electrons is measured with respect to the incident electron energy. This energy distribution – the electron energy-loss spectrum – directly reflects the target excitations, because an excitation leads to the appearance of electrons in the scattered beam which have suffered a characteristic energy loss corresponding to the excitation energy.

3), the kind of interaction between the incident electrons and the target that is responsible for the target excitation and the inelastic scattering process, can be inferred. Electron energy-loss spectroscopy has its roots in the fundamental, early experiment of James Franck and Gustav Hertz [43]. This experiment, originally intended for the determination of ionization energies of vapors and gases, led to the discovery of excitations between discrete energy levels in mercury atoms and therefore provided the experimental proof of Bohr’s postulate that forms the basis of modern quantum physics.

The symmetry and strength of the crystal field become similar to that of the bulk 6 The adsorption itself can be demonstrated by measuring the vibration frequencies of the adsorbed molecules by high-resolution electron energy-loss spectroscopy (Sect. 1). 3 3d States and d–d Transitions 25 at the adsorbate-covered surface (Fig. 8), and the excitation energies of the surface d–d transitions are shifted towards the bulk d–d excitation energies [44, 48]. Adsorption at surface defects on the other hand, has negligible influence on the surface 3d multiplet, and the surface d–d excitation energies remain unchanged.

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