A 150 kV High-Coherence Microscope

Abstract
Welton has shown that if the illuminating beam in a conventional transmission microscope column has a transverse coherence length of 5°0 Å, or greater, and an energy spread ≤0.2 eV(rms), spatial information at the 0.5 Å resolution level would be attenuated by a factor of 2 and 1 Å information essentially unimpaired. The untreated micrographs, which would show a complex set of fringes with detail down to about 2.5 Å as set by spherical aberration, would require the application of a Wiener filter function to bring out the existing finer details. This microscope was designed to produce the high coherence required, to permit this method of correction for the spherical aberration, and to be limited in no other way in resolution down to <1Å.

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