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	  Correction of Astigmatism  of Objective  
	  Lens in TEM based on Diffractogram   
	   - Practical Electron Microscopy and Database -    
	  - An Online Book -  
     
    
	
	
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http://www.globalsino.com/EM/   
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	      This book (Practical Electron Microscopy and Database) is a  reference for TEM and SEM  students, operators, engineers, technicians, managers, and  researchers.    
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              The astigmatism of  objective lens in TEM can be corrected based on diffractogram at high magnifications  [1]. This method  requires an amorphous phase of a thin region in a sample. 
                
                
              [1] D.B.Williams,C.B.Carter,TransmissionElectronMicroscopy,PlenumPress, 
                NewYork,1996. 
                
  
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