Abstract
Synopsis The absorption factor derived by the methods of Claassen and Bradley for a cylindrical crystal is applied to the case of a spherical crystal, for which a set of absorption factor tables is constructed. It is then shown that the absorption factor A for a cylindrical powder specimen consists of two parts, a micro-absorption factor t corresponding to the individual reflecting crystallites which are assumed to be spherical, and a, the macro-absorption factor for the specimen as a whole. The effects of crystallite aggregation, size and dilution upon A are discussed. Each constituent in a mechanical mixture must be given its own absorption factor on account of the different values of the micro-absorption factors which can only be neglected when the dimensions of the crystallites fall below 10-5 cm. The influence of the micro-absorption factor on the evaluation of the amplitude of atomic vibration is also briefly discussed.
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Schedule a callMore From: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science
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