Chemical effects in K spectra of X-ray emission induced by proton bombardment of 3d elements and their compounds

Mandić, Luka (2011) Chemical effects in K spectra of X-ray emission induced by proton bombardment of 3d elements and their compounds. Doctoral thesis, Faculty of Science > Department of Physics.

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Abstract

High resolution spectroscopy of x-ray emission induced by 2 and 3 MeV protons (PIXE) was used for chemical characterization of selected 3d elements (Ti, V, Cr) in various compounds. In the measured Kβ spectra, specific chemical effects were observed and their quantitative indicators were identified: the energy and intensity of Kβ2,5 and Kβ′′ x-ray lines, which posses a molecular character. In order to reveal the background of large discrepancies in the existing experimental data, obtained by different techniques (ion or photon induced x-ray emission) and data analysis procedures, measuring and modelling of presented spectra were performed in a consistent way. A new spectral model and data analysis procedures were developed to resolve the influence of the thick target self-absorption on induced x-ray emission. The developed model takes in account the fine structure of x-ray absorption coefficients near the K−edge. These coefficients were extracted from published XANES data measured for identical compounds. The collected data set of spectral parameters sensitive to chemical environment confirmed that the method could be usefull for: (i) ligand species identification in 3d metal compounds, (ii) determination of oxidation state of 3d metal, and (iii) average metal–ligand bond length determination.

Item Type: Thesis (Doctoral thesis)
Keywords: PIXE ; WDS ; high-resolution x-ray spectroscopy ; 3d elements ; Kβ spectrum ; oxidation state ; chemical effects ; ligand field ; average bond length ; inter-atomic transition ; absorption in thick target
Supervisor: Fazinić, Stjepko
Date: 25 May 2011
Number of Pages: 128
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 21 Dec 2013 23:23
Last Modified: 21 Dec 2013 23:23
URI: http://digre.pmf.unizg.hr/id/eprint/41

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