Lect05_notes

Abc cbems

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Unformatted text preview: $$$$$$$$$$$$$$$$$$()*+,, !-#$+%$&'$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$(+*+,, CBEMS 164 – XRD, SEM & Microanalysis: Lecture 05 ! 12 Influence of Accelerating Voltage! !"#$ ! ! ! ! ! ! %9-1*'2&%(+&021'%(,&+1,+&'( !"#$%&'()*+,")- .)&'%'/#'%'00'1, .)&'%1$2&#'3+4 .)&'%/252#' !""#$#%&'()* +,$'&*# 6*'2&%(+&021'%(,&+1,+&'( 7'((%/252#' 7'((%1$2&#'3+4 7)8%&'()*+,")- 7'((%'/#'%'00'1, 7)8 :2;%%<=%>?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%@%ABC== :2;%%C%>?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%@%ABC== CBEMS 164 – XRD, SEM & Microanalysis: Lecture 05 ! 13 The Electron Gun! Three prominent types of electron guns! ! W filament! ! LaB6 filament! ! Field Emission Gun (FEG)! ! ! !  Each emits electrons in an electric field that brings the beam to a focus! ! The first cross-over! ! ! !  The first...
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