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Line shifts in crystal powder diffractometers
Author(s) -
Popovici M.,
Stoica A. D.
Publication year - 1992
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889891011433
Subject(s) - optics , line (geometry) , x ray , neutron , crystal (programming language) , bragg's law , position (finance) , order (exchange) , physics , materials science , geometry , diffraction , mathematics , computer science , nuclear physics , finance , economics , programming language
The linear relations of the neutron and X‐ray optics in crystal powder diffractometers are extended with second‐order terms. An expression for the angular deviation from the Bragg‐peak position is derived which reduces to that of Wilson [ Mathematical Theory of X‐ray Powder Diffractometers (1963). Amsterdam: Philips Technical Library] for the case of characteristic X‐rays in parafocusing geometry. A technique of computing second‐order aberration effects is described. Line‐shift formulae are given for conventional and curved‐crystal diffractometers.