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Angular calibration in energy dispersive X-Ray diffraction by using genetic algorithms

Brunetti, Antonio and Rossi Albertini, Valerio and Bailo, Daniele (2009) Angular calibration in energy dispersive X-Ray diffraction by using genetic algorithms. Journal of X-Ray Science and Technology, Vol. 17 (3), p. 253-264. eISSN 1095-9114. Article.

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DOI: 10.3233/XST-2009-0226


In Energy Dispersive X-Ray diffraction measurements, the estimate of momentum transfer q, on which the diffracted intensity depends, should be as accurate as possible. Since q, in turn, depends on both the energy and the scattering angle, an error on the latter due to an incorrect positioning of the sample, to the asymmetric angular spread induced by the collimation slits or, in general, to any uncertainty on the geometric setup, results in an uncertainty on the q value. Here, a new self calibration method to correct such errors, based on a genetic algorithm is presented. It is robust, fast and completely automatic. Results obtained by carrying out Energy Dispersive X-Ray Diffraction measurements on reference samples are reported and discussed. They show how the application of such genetic algorithm may provide a fast esteem of the two parameters required when multiple angle pattern collection is performed, namely the effective starting angle and the angular step. In this way, reliable q-values of all the diffraction pattern features (Bragg peaks for crystalline, and diffused bumps for non-crystalline samples) are obtained.

Item Type:Article
ID Code:4645
Uncontrolled Keywords:GA, EDXRD, Bragg peaks
Subjects:Area 02 - Scienze fisiche > FIS/07 Fisica applicata (a beni culturali, ambientali, biologia e medicina)
Divisions:001 Università di Sassari > 03 Istituti > Matematica e fisica
Publisher:IOS Press
Deposited On:12 Oct 2010 10:41

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