|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5426998||1397241||2018||10 صفحه PDF||ندارد||دانلود رایگان|
â¢First time M sub-shell emission cross-section measurements at 5, 7 & 9â¯keV photons.â¢Comparison with theoretical evaluations from different model data for atomic parameters.â¢Measurements support the relativistic DF theory.â¢Explained deviations between measured and theoretical cross-sections with trends of the parameters with Z.â¢Spots of deviations almost coincide with crisscross/sharp variation in physical parameter trends.
M sub-shell X-ray fluorescence cross-sections of elements Pt, Au, Hg, Pb, Th and U have been measured with linearly polarized photon beams from Indus-II synchrotron source at Raja Ramanna Centre for Advanced Technology (RRCAT), India at tuned 5, 7 and 9â¯keV energies less than the L3 edge energy of elements. Measurements at present energies and elements are not available in literature. Therefore, measured cross-sections for MÎ¾, MÎ´, MÎ±, MÎ², MÎ³, Mm1 and Mm2 group of X-rays were compared with calculated theoretical values based upon Non Relativistic HartreeâSlater (NRHS) and relativistic Dirac-Fork (DF) and DiracâHartreeâSlater (DHS) models. The measured cross-sections along with our earlier quoted measurements at 8 and 10â¯keV by Kaur etÂ al. [Nucl. Instrum. Meth. B, 2014; 320: 37] are found in good agreement with DF and DHS values around 20% deviations and are highly deviated from NRHS values. Most of the spots of observed high deviations in measured and theoretical cross-sections are found to coincide with the presence of crisscrosses/sharp variations in contributing physical parameters photo-ionization cross-sections ÏMiâs and CosterâKronig yields fijâs with Zs.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 204, January 2018, Pages 232-241