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Analysis of X‐ray spectra by iterative least squares (AXIL): New developments
Author(s) -
Vekemans B.,
Janssens K.,
Vincze L.,
Adams F.,
Van Espen P.
Publication year - 1994
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1300230609
Subject(s) - gaussian , computer science , least squares function approximation , algorithm , spectral line , energy (signal processing) , series (stratigraphy) , interface (matter) , computer program , exponential function , iterative method , mathematics , mathematical analysis , physics , statistics , parallel computing , programming language , paleontology , bubble , quantum mechanics , astronomy , estimator , maximum bubble pressure method , biology
The functionality of the computer package AXIL (Analysis of X‐ray spectra by Iterative Least squares), suitable for the evaluation of energy‐dispersive X‐ray spectra, has been extended in a number of ways. First, a background modelling algorithm, based on the use of mutually orthogonal polynomials was introduced to replace the linear or exponential polynomials employed previously. Second, the Gaussian photopeak model employed in previous versions of the program was extended to include the non‐Gaussian parts of the characteristic peaks and related background contributions. Both innovations are shown to improve the performance of the spectrum evaluation procedure. Third, the user‐friendliness of the evaluation program was enhanced (a) by allowing a PC plug‐in MCA card to be directly controlled from within the program and (b) by extending the command‐interface to allow for repeated execution of series of commands by means of control loops. A brief description of these changes is given; as an application, the accurate evaluation of micro‐XRF images is discussed.