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首页> 外文期刊>Physical review >Plasmon losses in core-level photoemission spectra studied by the quantum Landau formula including full multiple scattering
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Plasmon losses in core-level photoemission spectra studied by the quantum Landau formula including full multiple scattering

机译：包括全多重散射在内的量子朗道公式研究的核心能级光发射光谱中的等离子损失

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摘要

We study the angular and energy dependence of surface and bulk plasmon losses accompanying deep core excitations in simple metals. Here full multiple scatterings of photoelectrons are taken into account before and after the plasmon losses within the quantum Landau formula, which can describe overall features of the photoemission bands. For example, multiple plasmon loss features can be calculated by use of the formula. Two simple metals, Al and Na, are studied here. The depth profiles of the plasmon losses are strongly influenced by the elastic scatterings. The model assuming single elastic scatterings overestimates the losses from deep emitters due to the forward focusing effects, whereas the model accounting for full multiple scatterings gives a much rapidly decaying function of the depth due to the defocusing effects and rich structures due to the photoelectron diffraction. The single elastic scattering approximation gives a poor result both for the depth profiles and for the loss spectra. The present multiple scattering calculations successfully explain the azimuthal dependence of the loss spectra, which reflect the local geometry around the emitters.
机译：我们研究了伴随简单金属中深核激发的表面和整体等离激元损耗的角度和能量依赖性。在此，在量子朗道公式内的等离激元损耗之前和之后都考虑了光电子的全多次散射，这可以描述光发射带的整体特征。例如，可以通过使用公式来计算多个等离子体激元损失特征。本文研究了两种简单的金属，即Al和Na。等离子体散射的深度分布受到弹性散射的强烈影响。假设单个弹性散射的模型由于正向聚焦效应而高估了深发射器的损耗，而考虑到全多次散射的模型由于散焦效应和光电子衍射所致的丰富结构而给出了深度的快速衰减函数。单一的弹性散射近似对于深度剖面和损耗谱均给出较差的结果。当前的多次散射计算成功地解释了损耗谱的方位角依赖性，该损耗谱反映了发射器周围的局部几何形状。

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