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Synchrotron-based uranium L-III edge X-ray absorption near-edge spectroscopy 一篇文献中看到的，这个 L-III edge 是指什么⊙_⊙感觉什么都不懂啊～先谢谢啦 发自小木虫Android客户端 |
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瑾陌琉觞: 金币+5, ★有帮助 2016-01-11 11:11:53
瑾陌琉觞: 金币+5, ★有帮助 2016-01-11 11:11:53
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Metal L-edge spectroscopy is a spectroscopic technique used to study the electronic structures of transition metal atoms and complexes. This method measures X-ray absorption caused by the excitation of a metal 2p electron to unfilled d orbitals (e.g. 3d for first-row transition metals), which creates a characteristic absorption peak called the L-edge. According to the selection rules, the transition is formally electric-dipole allowed, which not only makes it more intense than an electric-dipole forbidden metal K pre-edge (1s → 3d) transition,[1] but also makes it more feature-rich as the lower required energy (~400-1000 eV from scandium to copper) results in a higher-resolution experiment.[2] In the simplest case, that of a cupric (CuII) complex, the 2p → 3d transition produces a 2p53d10 final state. The 2p5 core hole created in the transition has an orbital angular momentum L=1 which then couples to the spin angular momentum S=1/2 to produce J=3/2 and J=1/2 final states. These states are directly observable in the L-edge spectrum as the two main peaks (Figure 1). The peak at lower energy (~930 eV) has the greatest intensity and is called the L3-edge, while the peak at higher energy (~950 eV) has less intensity and is called the L2-edge. https://en.wikipedia.org/wiki/Metal_L-edge |
4楼2016-01-08 08:11:56