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词汇 EDXA
分类 英语词汇 英语翻译词典
释义

EDXA

英汉-汉英词典
abbr. Energy Dispersive X-ray Analysis 能量弥散 X 射线分析
词组 | 习惯用语
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  • Edda n. 《埃达》(冰岛诗集)
  • Edgar n. 埃德加(男子名)
edxa 能量弥散x 射线分析(energy dispersive x-ray analysis)

网络短语:
EDXA 能谱分析; 分析仪;
edxa analysis edxa分析
ESEM-EDXA 扫描电镜能谱分析
SEM-EDXA 显微镜; 能谱仪; 能谱分析; 镜;
TEM-EDXA
random edxa analysis edxa分析
英语百科

Energy-dispersive X-ray spectroscopy

(重定向自EDXA)
EDS spectrum of the mineral crust of the vent shrimp Rimicaris exoculata[1]  It shows peaks caused by X-rays given off as electrons return to the K electron shell and one peak resulting from the L shell of iron.
Principle of EDS

Energy-dispersive X-ray spectroscopy (EDS, EDX, or XEDS), sometimes called energy dispersive X-ray analysis (EDXA) or energy dispersive X-ray microanalysis (EDXMA), is an analytical technique used for the elemental analysis or chemical characterization of a sample. It relies on an interaction of some source of X-ray excitation and a sample. Its characterization capabilities are due in large part to the fundamental principle that each element has a unique atomic structure allowing unique set of peaks on its X-ray emission spectrum. 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 energies of the X-rays are characteristic of the difference in energy between the two shells and of the atomic structure of the emitting element, EDS allows the elemental composition of the specimen to be measured.

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