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

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 overview of the current wisdom of the digital constitution of the monoxides, the spectroscopic approach utilized and its distinctive benefits are defined. the information and use of the various spin, attitude, and primary-energy dependences of a number of the proper inelastic electron-scattering mechanisms supply new insights into the excitation methods of the optically forbidden transitions among the crystal-field-split 3d states of the majority and of the outside.

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Read or Download d-d Excitations in Transition-Metal Oxides: A Spin-Polarized Electron Energy-Loss Spectroscopy (SPEELS) Study (Springer Tracts in Modern Physics) PDF

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Additional 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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5) k0 −k1 34 3. 5 − ∆E ∆E 2E 0 2E 0 scattering angle θ Fig. 3. 6) and the square of the transferred wave vector is then determined by 2 q 2 = q⊥ + q2 k02 θ2 + ∆E 2E0 2 . 2) gives σdiff ∝ 1 q2 1 . 8) This differential cross section has the shape of a Lorentz profile with a full width at half maximum (FWHM) of 2(∆E/2E0 ). The intensity of the electrons scattered in an inelastic dipole scattering process is therefore expected to be confined to the so-called “dipolar lobe”, which is strongly peaked in the forward direction.

Electron exchange seems to depend on the material and the specific kind of excitation. From experiments and calculations concerning free atoms and molecules, exchange is generally thought to be significant for primary energies which are not substantially larger than the excitation energy needed (typically up to ten times as large). The idea behind this belief is that exchange becomes more probable when the velocities of the free incident and bound target electrons involved in the collision are comparable [71].

For higher primary energies, the cross section for excitation by exchange processes decreases strongly. 5 eV [102, p. 130]. 3 In our SPEELS investigations [50, 51, 52, 55, 56] of the d–d excitations in MnO, CoO, and NiO with primary energies up to 130 eV (Chap. 5), exchange was found to be significant even at these high energies, which exceed the d–d excitation energies (Figs. 3) by two orders of magnitude. Stimulated by these results from our spin-polarized electron energyloss measurements and earlier EELS results with unpolarized electrons [44, 65], Michiels et al.

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