Electron Microscope Studies on Colloidal Silver Iodide employing Cinematographic Techniques

Abstract

THE examination of crystals of silver halides in the electron microscope is of considerable interest in view of their importance in photography. So far, most research has been carried out with crystals from photographic emulsions having sizes of the order of 5µ or greater. However, crystals of such magnitude suffer from the disadvantage that they are sufficiently thick to be opaque to an electron beam and usually decompose rapidly in the beam¹; this is particularly so with silver bromide, which has been most investigated. This has led largely to the use of replica techniques for their examination². Particles of colloidal dimensions seem to have received very little attention, possibly owing to the relatively low magnification and resolving powers of earlier electron microscopes.