Naslov
Multiple ionization X-ray satellites of magnesium, aluminum and silicon in alpha particle PIXE

Autori
Heirwegh, C. M. ; Petric, Marko ; Fazinić, Stjepko ; Kavčič, Matjaž ; Božičević Mihalić, Iva ; Schneider, J ; Zamboni, Ivana ; Campbell, J.L.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts / Kavčič, M. ; Žitnik, M. ; Hrast, M. ; Bučar, K. - Ljubljana : Institut Jožef Stefan, 2018, 98-98

ISBN
978-961-264-126-9

Skup
European Conference on X-Ray Spectrometry (EXRS2018)

Mjesto i datum
Ljubljana, Slovenija, 24.06.2018. - 29.06.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
multiple ionization ; Al ; Si ; He ions

Sažetak
The Curiosity rover’s alpha particle X-ray spectrometer employs simultaneous XRF and PIXE to analyze rock and soil samples on the Martian surface. The PIXE is accomplished by alpha particle emission from 244Cm, and the XRF by the L X-rays from the daughter. Recent work [1] has shown that fits to these spectra, which extend over a 23 keV range, are improved by accounting rigorously for both X-ray detector non-linearity and the alpha-induced multiple ionization satellites. This work necessitated the insertion of an interim satellite database into the GUPIX-based fitting code GUAPX. The database was assembled from a rather sparse literature and involved considerable extrapolation and interpolation. For 3- 5 MeV alphas, the summed intensity in the KL1 , KL2 , KL3 satellites is of similar order to that of the KL0 diagram line. It is clear that the accuracy of laboratory-based PIXE with alpha particles can be improved by including these in the spectrum fitting procedure. We have therefore started an effort to refine and extend the interim satellite database, using WDX spectroscopy at IJS and IRB. Work has been completed on magnesium, aluminum, silicon and their oxides. The spectra below are from Si and SiO2 ; all individual Voigtians are shown. Comparison of our results for individual line energies and intensities with those of the database has enabled small corrections to the latter. The work will now proceed to elements of higher atomic number. [1] J. L. Campbell, B. Ganly, C. M. Heirwegh, J. A. Maxwell, Nucl. Instr. Meth. B414, 2018, 38.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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