Simultaneous PIXE and RBS data analysis using Bayesian inference with the DataFurnace code

Abstract

Note: This is a preprint of a work published in Nuclear Instruments and Methods in Physics Research Section B 249, 780-783 (2006). Please cite the published one. AbstractThe Rutherford Backscattering Spectroscopy (RBS) and Particle Induced X-ray Emission (PIXE) techniques can be used to obtain complementary information about the characteristics of a sample but, traditionally, a gap has separated the available computer codes for analyzing data from each technique, being hard to simultaneously analyze data from the same sample. The recent development of a free and open source library, LibCPIXE, for PIXE simulation and analysis of arbitrary multilayered samples, has permitted to integrate this technique into the DataFurnace code which already handles many other IBA techniques such as Rutherford and non-Rutherford backscattering, elastic recoil detection, and non-resonant nuclear reaction analysis. The fitting capabilities of DataFurnace can therefore now be applied to PIXE spectra as well, including the Bayesian Inference analysis and the simultaneous and coherent fitting of multiple spectra from different techniques. Various examples are presented in which the simultaneous RBS and PIXE analysis allows us to obtain consistent results that cannot be obtained by independent analysis of the data from each technique.

Characterisation of thin film chalcogenide PV materials using MeV ion beam analysis

“…NDF has a double scattering calculation [22], and this was included here. The PIXE data were analyzed using the DATTPIXE code of Reis [15] as implemented in NDF by the LibCPIXE module [16]. LibCPIXE interprets characteristic X-ray line areas (specifically: of Kα1+Kα2 or Lα1+Lα2) extracted from the raw data, in this case using GUPIX ( [27], [28]: with the output giving 2*FHWM centred on the main peak) which is also a validated code [29] (see Fig.1).…”

“Total IBA” – Where are we?

“…A fully self-consistent and convenient PIXE/BS analysis code based on the DataFurnace [46] and DATTPIXE [47] codes was introduced in 2006 [48]. This was used to analyse Niepce's heliograph of 1827 [49], a 19 th century reproduction of Frans Hals' La Bohé-mienne [50], oxidation of carbon nanotubes [51] and photovoltaic and ferroelectric mate-rials [52] [53] [54].…”

Advanced physics and algorithms in the IBA DataFurnace

“…One of the important points in NDF is that it supports PIXE, being the sole code for general analysis of IBA data [13,14] that fully integrates PIXE with RBS, ERDA, and NRA [19,20]. Any number of spectra collected from the same sample, taken with any of these techniques in any experimental condition, can be analysed simultaneously with the same depth profile as fit parameter [21].…”

“…All complementary information present in each spectrum is thus used to generate one single solution, consistent with all data. Incidentally, this makes differential PIXE trivial to do [20].…”