USE OF FIELD EMISSION ELECTRON MICROSCOPE 



929 



1330° K V 



5 MINUTES 



V= 5000^ L= 50/iA 



2/5 SECOND 



T = 1515°K V = 



5 MINUTES 



V= 8350 L= lOfjifK 



1/5 SECOND 



T=:1380°K V=0 



5 MINUTES 



V=6000 L=50/iA 



2/5 SECOND 



T=1670°K V = 



3 MINUTES 



V = 9250 L = 27/£A 



2/5 SECOND 



T = 1430»K V = 



5 MINUTES 



V=7130 1 = 10 fjLA 



I/5 SECOND 



9000 L= 30 /iA 



2/5 SECOND 



Fig. 10— Evaporation of Ba on W from 1330 to 1670°K. 



