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Titolo:
THE ABSORPTION-CORRECTION 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:
0108-7673(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 ABSORPTION-CORRECTION FACTOR OF MULTIFACETED CRYSTALS", Acta crystallographica. Section A, Foundations of crystallography, 49, 1993, pp. 692-697

Abstract

A mathematical analysis of the evaluation of the absorption-correction 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 absorption-correction factor and its derivatives, with negligible rounding-errorproblems. 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