LAUSR

Abstract The recent advances in the instrumental operating detection system provide better understanding of the several atomic parameters such as characteristic x-ray emission lines, relative intensity ratio and line-width, transition probabilities, Coster-Kronig transitions and fluorescence yields. At present, the qualitative and quantitative analysis in wavelength dispersive spectrometers are routinely performed by the fundamental parameter approach method, but none of the approaches have been implemented in the routine analysis to test the possible influence of chemical effects in different chemical compounds. The study of chemical effects with high resolution curved crystals offers a great opportunity to enhance the analytical potential of WDXRF instruments. In the present work, high resolution Lα and Lβ1 emission spectra of 38Sr compounds have been measured with wavelength dispersive spectrometer. First time, spectral structures correlated to the satellite lines and their energy shifts are determined. In Lα energy region, three satellite peaks (Lα′, Lα″ and Lα‴) and in Lβ1 region, two satellite peaks (Lβ1′ and Lβ1″) are observed. To confirm the origin of the satellite peaks associated with each of the Lα and Lβ1 diagram lines, we have calculated the theoretical values of energies by using available Hartree-Fock-Slater approximation based on K-LM and L-MN Auger transition energies. The measured and calculated values of the satellite peak energies are found in good agreement with each other. The possible causes of energy shifts such as Coster-Kronig transitions, effective charge, relative intensity ratio and line-width, screening effect, shake process and electro-negativity and their roles in different 38Sr compounds are also discussed.