Electron microscopy
 
EELS Measurement of Iron (Fe)
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In practical analytical measurements, Fe EELS signal is normally obtained from Fe L3 edge (710 eV), which is in general a better choice than Fe EDS signal.

Figure 1282 (a) shows Fe L2,3 (710 eV) energy loss edge of nano-crystalline mineral ferrihydrite (FHY) obtained at an acquisition time of 0.05 s per pixel which provided the maximum electron dose without internal atomic rearrangement in the material. In this spectrum, the noise level is too high. Therefore, a spectrum, as shown in Figure 1282 (b), with good SNR had to be obtained by summing such noisy spectra of many pixels taken from identical materials.

Fe L2,3 energy loss edge of nano-crystalline mineral ferrihydrite (FHY)

Figure 1282. (a) Fe L2,3 energy loss edge of nano-crystalline mineral ferrihydrite (FHY) obtained at an acquisition time of 0.05 s per pixel (electron dose: <104-105 electrons/nm2), and (b) A spectrum with good SNR obtained by summing such noisy spectra in (a) of many pixels taken from identical materials. [1]

 

 

 

 

 

 

 

 


[1] G. Vaughan, A.P. Brown, R. Brydson, K. Sader, A low electron fluence EELS study of Fe-coordination within ferrihydrite and phosphorous doped ferrihydrite nanoparticles, EMC 2008 14th European Microscopy Congress Volume 1 Instrumentation Methods Luysberg.

 

 

 

 

 

 

 

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