| 查看: 336 | 回复: 2 | |||
dingzhimin木虫 (正式写手)
|
[交流]
【求助】材料表征 已有2人参与
|
| EDX是材料表针中什么的缩写呀？ |
回复此楼» 猜你喜欢
中国科学院兰州化物所夏令营招生
已经有1人回复
-
γ-NiOOH的cif文件求助
已经有0人回复
-
专业论文润色/翻译怎么收费?
已经有252人回复
-
国家青年基金祈福
已经有58人回复
-
分子筛催化剂
已经有1人回复
-
青岛大学国家优青团队急招一名26年秋季入学博士（报名截止时间为6月17号下午1点）
已经有8人回复
-
福建理工大学资源化学专业正式获批并启动招生
已经有27人回复
-
Crystals（IF=2.9）- Special Issue invatation- Functional Materials
已经有0人回复
-
分子筛催化方向 一篇cej共一第一 可以申请上海什么学校呢
已经有2人回复
-
求助共晶分子筛的电镜图分析，有偿
已经有0人回复
» 本主题相关商家推荐: (我也要在这里推广)
aust_jhe
至尊木虫 (著名写手)
- C-EPI: 1
- 应助: 62 (初中生)
- 金币: 17354.5
- 红花: 9
- 帖子: 1192
- 在线: 209.6小时
- 虫号: 430372
- 注册: 2007-08-05
- 性别: GG
- 专业: 催化化学
★ ★ ★
小木虫(金币+0.5):给个红包，谢谢回帖交流
zhangwengui330(金币+2):谢谢应助！！ 2010-05-21 21:40:18
小木虫(金币+0.5):给个红包，谢谢回帖交流
zhangwengui330(金币+2):谢谢应助！！ 2010-05-21 21:40:18
|
Energy-dispersive X-ray spectroscopy Energy dispersive X-ray spectroscopy (EDS or EDX) is an analytical technique used for the elemental analysis or chemical characterization of a sample. It is one of the variants of X-ray fluorescence spectroscopy which relies on the investigation of a sample through interactions between electromagnetic radiation and matter, analyzing X-rays emitted by the matter in response to being hit with charged particles. Its characterization capabilities are due in large part to the fundamental principle that each element has a unique atomic structure allowing X-rays that are characteristic of an element's atomic structure to be identified uniquely from one another. To stimulate the emission of characteristic X-rays from a specimen, a high-energy beam of charged particles such as electrons or protons (see PIXE), or a beam of X-rays, is focused into the sample being studied. At rest, an atom within the sample contains ground state (or unexcited) electrons in discrete energy levels or electron shells bound to the nucleus. The incident beam may excite an electron in an inner shell, ejecting it from the shell while creating an electron hole where the electron was. An electron from an outer, higher-energy shell then fills the hole, and the difference in energy between the higher-energy shell and the lower energy shell may be released in the form of an X-ray. The number and energy of the X-rays emitted from a specimen can be measured by an energy dispersive spectrometer. As the energy of the X-rays are characteristic of the difference in energy between the two shells, and of the atomic structure of the element from which they were emitted, this allows the elemental composition of the specimen to be measured. |
2楼2010-05-21 21:17:36
dingzhimin
木虫 (正式写手)
- 应助: 0 (幼儿园)
- 金币: 1984.7
- 散金: 220
- 红花: 1
- 帖子: 848
- 在线: 106.5小时
- 虫号: 773518
- 注册: 2009-05-18
- 专业: 无机材料化学
3楼2010-05-22 07:46:03