| 查看: 686 | 回复: 7 | ||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | ||
[求助]
候君久矣汝知否
|
||
|
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 |
回复此楼» 猜你喜欢
346求调剂[0856]
已经有7人回复
-
一志愿山大07化学 332分 四六级已过 本科山东双非 求调剂！
已经有3人回复
-
310求调剂
已经有3人回复
-
机械专硕299求调剂至材料
已经有4人回复
-
070300化学319求调剂
已经有7人回复
-
08工科 320总分 求调剂
已经有6人回复
-
一志愿天津大学化学工艺专业（081702）315分求调剂
已经有12人回复
-
307求调剂
已经有3人回复
-
265求调剂
已经有3人回复
-
301求调剂
已经有10人回复
8楼2016-01-11 16:13:18
2楼2016-01-07 21:13:39
3楼2016-01-07 21:18:25
qfw_68
版主 (文坛精英)
有尾巴的青蛙
- 博学EPI: 2910
- 应助: 120 (高中生)
- 贵宾: 0.414
- 金币: 85720.6
- 散金: 3020
- 红花: 212
- 沙发: 7684
- 帖子: 39484
- 在线: 4852.6小时
- 虫号: 797958
- 注册: 2009-06-24
- 性别: GG
- 专业: 自然语言理解与机器翻译
- 管辖: 有奖问答
【答案】应助回帖
★ ★ ★ ★ ★
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
|
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
