The electron microscope, its development, The electron microscope, its development, present performance and future possibilities . electronmicrosco00gabo Year: 1948 116 Tlie Electron Microscope stant is determined by the ratio beween electron injection and removal. If the removal is negligible, electrons will accumulate in the accessible space until they have depressed the potential at the inner radius to the level of the cathode potential. The inner radius itself moves outward during this accumulation, until it reaches the magnetic field line passing through the cathode. From this moment on,
The electron microscope, its development, The electron microscope, its development, present performance and future possibilities . electronmicrosco00gabo Year: 1948 116 Tlie Electron Microscope stant is determined by the ratio beween electron injection and removal. If the removal is negligible, electrons will accumulate in the accessible space until they have depressed the potential at the inner radius to the level of the cathode potential. The inner radius itself moves outward during this accumulation, until it reaches the magnetic field line passing through the cathode. From this moment on, no further electrons can leave the cathode; the cloud is saturated. The initial velocities of the electrons will produce near the boundary departures from the — law, which results in blurring of the edges. £ktended cathode, orinttracbion. Fig. 42
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