Experimental Research on Resolution of Electron Microscope

Abstract

Two ways for mearsuring the resolving power of electron microscope are compared. They concern with (1) the separations of evaporated particles of heavy metal such as Pt-Ir and (2) the lattice spacing of crystal such as Cu-phthalocyanine, respectively.
The former is a reasonable method, but it is difficult apply it to the range less then 10 A. U., owing to the difficulties in specimen preparation and the specimen alteration during observation.
The latter method is appreciated in the range of higher resolving power, though better value of resolving power may be expected due to the insensitiveness of spherical aberration and astigmatism with the image formation.