Study of chemical effects on L X-rays spectra of ₅₉Pr compounds using high resolution WDXRF and EDXRF measurements

Chemical effects on L X-rays spectra of PrF₃, PrCl₃, PrBr₃, Pr₂O₃, Pr₆O₁₁ and Pr₂(SO₄)₃ compounds have been investigated from measured IL_i/IL_α (i = l and β₆), IL_j/IL_β1 (j = η, γ₅ and γ₁), IL_k/IL_γ1 (k = γ₅ and η) intensity ratios using high resolution poly-chromatic WDXRF, and monochromatic excitation by 6.49 keV in vacuum (10^-2 Torr) and Ag K_αβ (22.581 keV) X-rays photons in EDXRF spectrometers. The experimental results clearly exhibit significant variation in measured intensity ratios of L X-ray components of investigated compounds from pure elemental form and theoretically predicted values evaluated using different atomic parameters. Furthermore, the change in inner shell/subshells binding energy resulting from the transitions of outer shell/subshell electrons is also inferred from the shifts of order ∼0.1-0.70 eV in L_l, L_β2 and L_γ1 components of PrF₃, PrCl₃, PrBr₃, Pr₂O₃, Pr₆O₁₁ and Pr₂(SO₄)₃ WDXRF spectra relative to pure ₅₉Pr. The variation in intensity ratios and shift in Ll, L_β2 and L_γ1 X-ray components of ₅₉Pr compounds are attributed to crystal defects, structural effects and exchange interactions between core and valence electrons of different ligands attached to central ₅₉Pr atom. The reliable experimental data would be helpful in the theoretical interpretation of standard reference data for inner-shell vacancy decay parameters used in X-ray fluorescence analysis of compound samples.