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首页> 外文期刊>Physical review >Angle-resolved electron energy-loss spectroscopy investigation of crystal-field transitions on MnO and NiO surfaces: Exchange scattering versus direct scattering
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Angle-resolved electron energy-loss spectroscopy investigation of crystal-field transitions on MnO and NiO surfaces: Exchange scattering versus direct scattering

机译：角分辨电子能量损失谱研究MnO和NiO表面上的晶体场跃迁：交换散射与直接散射

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In electron energy-loss spectroscopy, the excitation of low energy transitions, such as the crystal-field transitions in 3d transition-metal oxides, takes place via two scattering mechanism, namely, direct scattering and exchange scattering. The angular cross sections of both scattering mechanisms have been investigated by angular resolved electron energy-loss spectroscopy by comparing the angular intensity distributions of the crystal-field transitions on MnO and NiO. In MnO, the spin-forbidden sextet quartet are excited only by electron exchange scattering with nonuniform cross sections, resulting in nearly isotropic angular intensity distributions for extended energy-loss ranges. In NiO, the excitation of the spin-allowed triplet-triplet transitions is also possible by direct scattering for which the forward scattering is additionally modulated by the reciprocal surface lattice. The angular intensity distributions for extended energy-loss ranges in NiO display a large low-energy electron diffraction-like anisotropy from direct scattering on a broad exchange-scattering background.
机译：在电子能量损失谱中，低能跃迁（例如3d过渡金属氧化物中的晶体场跃迁）的激发是通过两种散射机制发生的，即直接散射和交换散射。通过比较MnO和NiO上晶体场跃迁的角强度分布，通过角分辨电子能量损失谱研究了这两种散射机制的角截面。在MnO中，自旋禁忌的六重奏四重奏仅通过具有不均匀横截面的电子交换散射来激发，从而在扩展的能量损耗范围内产生几乎各向同性的角强度分布。在NiO中，也可以通过直接散射来激发自旋允许的三重态-三重态跃迁，为此，正向散射还由相互的表面晶格进行调制。 NiO中扩展的能量损失范围的角强度分布由于在广泛的交换散射背景上的直接散射而显示出大的低能电子衍射状各向异性。

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