CXXIII. Some properties of lines on divergent-beam x-ray photographs

Abstract

The quantitative aspect of x-ray extinction is reconsidered in its particular relation to divergent-beam photography. Special consideration is given to the optical resolution obtainable with the usual experimental arrangements, and some experimental data on unresolved lines are discussed. This leads to a determination of the mosaic spread of crystals previously conditioned by liquid air treatment to minimize primary extinction effects, but in general quantitative conclusions are hampered by the usual doubt as to how much of the observed extinction is primary and how much secondary.