کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5426998 1397241 2018 10 صفحه PDF ندارد دانلود رایگان
عنوان انگلیسی مقاله
M sub-shell X-ray fluorescence cross-section measurements for six elements in the range Z = 78–92 at tuned synchrotron photon energies 5, 7 and 9 keV.
کلمات کلیدی
Synchrotron photons; M sub-shell x-rays; X-ray fluorescence cross-sections; Coster- kronig transitions; Fluorescence yields;
موضوعات مرتبط
مهندسی و علوم پایه شیمی طیف سنجی
پیش نمایش صفحه اول مقاله
M sub-shell X-ray fluorescence cross-section measurements for six elements in the range Z = 78–92 at tuned synchrotron photon energies 5, 7 and 9 keV.
چکیده انگلیسی

•First time M sub-shell emission cross-section measurements at 5, 7 & 9 keV photons.•Comparison with theoretical evaluations from different model data for atomic parameters.•Measurements support the relativistic DF theory.•Explained deviations between measured and theoretical cross-sections with trends of the parameters with Z.•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 9 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 Mξ, Mδ, Mα, Mβ, Mγ, Mm1 and Mm2 group of X-rays were compared with calculated theoretical values based upon Non Relativistic Hartree–Slater (NRHS) and relativistic Dirac-Fork (DF) and Dirac–Hartree–Slater (DHS) models. The measured cross-sections along with our earlier quoted measurements at 8 and 10 keV by Kaur et 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 σMi’s and Coster–Kronig yields fij’s with Zs.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 204, January 2018, Pages 232-241
نویسندگان
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