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Titolo: THE ABSORPTIONCORRECTION FACTOR OF MULTIFACETED CRYSTALS
Autore: CLARK RC;
 Indirizzi:
 UNIV ABERDEEN,DEPT MATH SCI ABERDEEN AB9 2UE SCOTLAND
 Titolo Testata:
 Acta crystallographica. Section A, Foundations of crystallography
,
volume: 49,
anno: 1993,
parte:, 5
pagine: 692  697
 SICI:
 01087673(1993)49:<692:TAFOMC>2.0.ZU;2#
 Fonte:
 ISI
 Lingua:
 ENG
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Citazioni:
 12
 Recensione:
 Indirizzi per estratti:



 Citazione:
 R.C. Clark, "THE ABSORPTIONCORRECTION FACTOR OF MULTIFACETED CRYSTALS", Acta crystallographica. Section A, Foundations of crystallography, 49, 1993, pp. 692697
Abstract
A mathematical analysis of the evaluation of the absorptioncorrection factors in convex polyhedral crystals is made. Formulae are given that permit the exact evaluation of the factors and their derivatives and that do not depend on the subdivision of the crystal into tetrahedra. A new method of defining the Howells polyhedra as the included volume of a set of planes is also described. The method allows additional constraints to be introduced, which could be used to deal with inhomogeneities in either the crystal or the incident beam. Computation based on these ideas gives rapid and exact evaluation of both the absorptioncorrection factor and its derivatives, with negligible roundingerrorproblems. In addition, a formula is given for scattering by a generaltetrahedron with a wide range of orientations that can be used as a test of computer programs.
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Documento generato il 31/03/20 alle ore 22:02:26