The electron microscope, its development, The electron microscope, its development, present performance and future possibilities . electronmicrosco00gabo Year: 1948 Possibilities of Future Development 113 = 8nic' (Ur) (39) and the electrons will not l)e able to reach the sheath electrode 'A' if its potential V against the cathode is less than a certain value Ve which is obtained by substituting the radius of 'A' into equation (39). Vp is Hull's critical potential. It is known that in practice \^ has to be made somew^hat smaller than \> if anode currents are to be avoided. This effect is p
The electron microscope, its development, The electron microscope, its development, present performance and future possibilities . electronmicrosco00gabo Year: 1948 Possibilities of Future Development 113 = 8nic' (Ur) (39) and the electrons will not l)e able to reach the sheath electrode 'A' if its potential V against the cathode is less than a certain value Ve which is obtained by substituting the radius of 'A' into equation (39). Vp is Hull's critical potential. It is known that in practice \^ has to be made somew^hat smaller than \> if anode currents are to be avoided. This effect is probably due to electron collisions, and has never been fully explained. 41a Magnetic Field
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