Single-atom electron energy loss spectroscopy of light elements.
Single-atom electron energy loss spectroscopy of light elements.
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DOI：
10.1038/ncomms8943
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发表时间：
2015-07-31
影响因子：
16.6
通讯作者：
Suenaga K
中科院分区：
文献类型：
--
作者：
Senga R;Suenaga K
轻元素，如碱金属（锂，钠）或卤素（氟，氯）存在于各种物质中，确实在我们的生活中发挥着重要作用。虽然这些元素的原子行为往往是解决化学或生物活性的关键，但它们在透射电子显微镜下几乎不可见，因为它们的散射功率较小，撞击概率较高。在这里，我们提出了一个概念，用于检测轻原子囚禁在一个nanospace通过电子能量损失谱使用非弹性散射电子。在这种方法中，我们证明了锂，氟，钠和氯的单原子检测与近原子精度，这是有限的入射探针的大小，信号离域和纳米空间中的原子运动。此外，在一维锂化合物的各种原子构型中，锂K边的化学位移已被成功地确定。光原子通过标准的显微镜技术几乎不可见，因为它们的散射能力较小，撞击概率较高。在这里，作者提出了一种方法来探测轻原子的电子能量损失谱，依赖于非弹性散射的电子。
Light elements such as alkali metal (lithium, sodium) or halogen (fluorine, chlorine) are present in various substances and indeed play significant roles in our life. Although atomic behaviours of these elements are often a key to resolve chemical or biological activities, they are hardly visible in transmission electron microscope because of their smaller scattering power and higher knock-on probability. Here we propose a concept for detecting light atoms encaged in a nanospace by means of electron energy loss spectroscopy using inelastically scattered electrons. In this method, we demonstrate the single-atom detection of lithium, fluorine, sodium and chlorine with near-atomic precision, which is limited by the incident probe size, signal delocalization and atomic movement in nanospace. Moreover, chemical shifts of lithium K-edge have been successfully identified with various atomic configurations in one-dimensional lithium compounds. Light atoms are hardly visible through standard microscopy techniques, because of their smaller scattering power and higher knock-on probability. Here, the authors present an approach to probe light atoms by means of electron energy loss spectroscopy, relying on inelastically scattered electrons.