Quote /About Microscopy and From Microscopists

Ernst Ruska

"We replaced the wave length of the light by the wave length of electrons at an accelerating voltage of 75 kV and inserted into the Abbe relation the imaging accelerating voltage of 75 kV and inserted into the Abbe relation the imaging accelerating voltage of 75 kV and inserted into the Abbe relation the imaging aperture of 2 X 10-2 rad...we came up with a resolution limit of 2.2 Å ."

The resolution limit of 2.2 Å predicate by Ruska and Knoll in 1932 was obtained 40 years later. At that time it was regarded as a "pipe-dream".

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The Development of the Electron Microscope and of Electron Microscopy

From Nobel Lectures, Physics 1981-1990, Editor-in-Charge Tore Frängsmyr, Editor Gösta Ekspång, World Scientific Publishing Co., Singapore, 1993

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