LXIX. The limiting resolving power of the electron microscope

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Abstract
The final resolving power of the magnetic electron microscope is limited by magnetic saturation of the pole pieces which leads to an increase in the minimum focal length and the minimum spherical and chromatic aberration constants if the accelerating voltage is increased. From the minimum spherical aberration constants obtained by combining Ramberg's theoretical work with measurements carried out by the writer, an estimate is obtained of the expected limit of resolving power that may be achieved in electron microscopes of the present type. This limiting resolving power has a slightly marked optimum for an accelerating voltage of 50 KV., and is of the order of 10 to 12 A.