Simultaneous EDS and EELS Analysis in the TEM

2020/06/15   下载量: 1

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Introduction In Transmission Electron Microscopy (TEM) there are two ‘go to’ techniques for elemental analysis: Energy Dispersive X-ray Spectroscopy, (EDS), and Electron Energy Loss Spectroscopy, (EELS). EDS is a mature technique that can be used for most specimens. The intensity of generated X-rays is proportional to the mass thickness of the sample. However, this can become a limitation for very thin specimens or those comprising light elements. On the other hand, EELS is more suitable for thin samples where the thickness is less than the inelastic mean free path of electrons in the material. EELS does, however, give high signal to noise for light elements. Simultaneous acquisition of both signals is a powerful tool for materials analysis.

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Introduction

In Transmission Electron Microscopy (TEM) there are two ‘go to’ techniques for elemental analysis: Energy

Dispersive X-ray Spectroscopy, (EDS), and Electron Energy Loss Spectroscopy, (EELS).

EDS is a mature technique that can be used for most specimens. The intensity of generated X-rays

is proportional to the mass thickness of the sample. However, this can become a limitation for very

thin specimens or those comprising light elements. On the other hand, EELS is more suitable for thin

samples where the thickness is less than the inelastic mean free path of electrons in the material. EELS

does, however, give high signal to noise for light elements. Simultaneous acquisition of both signals is a

powerful tool for materials analysis.


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