Total and <i>K</i>-shell photoeffect cross sections at <i>K</i>-edges of Cu, Zr, Ag, Sn, Ta, Au, and Pb

Puttaswamy, K. S.; Gowda, Ramakrishna; Sanjeevaiah, B.

doi:10.1139/p81-109

Cited by 9 publications

(8 citation statements)

References 1 publication

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“…Puttaswamy et al [33] (diamonds), Sandiago and Gowds [3] (triangles) and Visweswara et al [34] (squares). The tabulation from Henke, which is a synthesis between the theoretical input from [29,35] and experimental data, clearly shows significant discrepancies with other theoretical and experimental data.…”

Section: Comparison Between Theory and Experimentsmentioning

confidence: 99%

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Measurement of the x-ray mass attenuation coefficient of silver using the x-ray-extended range technique

Tran

Chantler

Barnea

et al. 2004

J. Phys. B: At. Mol. Opt. Phys.

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We used the x-ray-extended range technique to measure the x-ray mass attenuation coefficients of silver in the 15-50 keV energy range with a level of uncertainty between 0.27% and 0.4% away from the K-edge. The imaginary part of the atomic form factor of silver was derived by subtracting the scattering component from the measured total mass attenuation coefficients. Discrepancies between the measured mass attenuation coefficients and alternative theoretical predictions are discussed.

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Section: Comparison Between Theory and Experimentsmentioning

confidence: 99%

“…Semiempirical tabulation of Henke et al [31] (dotted-dashed line) are available up to 30 keV. Other experimental data include those from Machali et al [32] (asterisks), Puttaswamy et al [33] (diamonds), Sandiago and Gowds [3] (triangles) and Visweswara et al [34] (squares). [32] (asterisks), Figure 11.…”

Section: Summary Of Uncertaintiesmentioning

confidence: 99%

Measurement of the x-ray mass attenuation coefficient of silver using the x-ray-extended range technique

Tran

Chantler

Barnea

et al. 2004

J. Phys. B: At. Mol. Opt. Phys.

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“…(1) A gamma-ray attenuation method, where gamma-rays are attenuated through a sample and the attenuation coefficient is determined (Puttaswamy et al, 1981;Ouseph et al, 1982;Mallikarjuna et al, 2002). The early key idea was to have a radioactive source with lines on either side of the absorption edge and use the relative attenuation to determine the jump ratio and jump factor for the edge.…”

Section: X-ray Absorption Edge Jumps and Edge Jump Ratiosmentioning

confidence: 99%

High-accuracy measurement of mass attenuation coefficients and the imaginary component of the atomic form factor of zinc from 8.51 keV to 11.59 keV, and X-ray absorption fine structure with investigation of zinc theory and nanostructure

Ekanayake¹,

Chantler²,

Sier³

et al. 2021

J Synchrotron Radiat

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High-accuracy X-ray mass attenuation coefficients were measured from the first X-ray Extended Range Technique (XERT)-like experiment at the Australian Synchrotron. Experimentally measured mass attenuation coefficients deviate by ∼50% from the theoretical values near the zinc absorption edge, suggesting that improvements in theoretical tabulations of mass attenuation coefficients are required to bring them into better agreement with experiment. Using these values the imaginary component of the atomic form factor of zinc was determined for all the measured photon energies. The zinc K-edge jump ratio and jump factor are determined and results raise significant questions regarding the definitions of quantities used and best practice for background subtraction prior to X-ray absorption fine-structure (XAFS) analysis. The XAFS analysis shows excellent agreement between the measured and tabulated values and yields bond lengths and nanostructure of zinc with uncertainties of from 0.1% to 0.3% or 0.003 Å to 0.008 Å. Significant variation from the reported crystal structure was observed, suggesting local dynamic motion of the standard crystal lattice. XAFS is sensitive to dynamic correlated motion and in principle is capable of observing local dynamic motion beyond the reach of conventional crystallography. These results for the zinc absorption coefficient, XAFS and structure are the most accurate structural refinements of zinc at room temperature.

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“…The K shell oscillator strength is the probability of transition of the K shell electrons to all allowable states. Several investigators determined the Davisson-Kirchner ratio and/ or K shell oscillator strength values for the different elements [34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Chemical effect on theKshell absorption parameters of some selected cerium compounds

2016

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In this study, the photoelectric cross section values of Ce, CeCl 3 .7H 2 O, Ce 2 (SO 4 ) 3 , Ce(OH) 4 and Ce 2 O 3 samples were measured in the energy range from 31.82 keV up to 51.70 keV by adopting in narrow beam geometry. Using these photoelectric cross sections, the K shell photoelectric cross sections at the K-edge, the K shell absorption jump ratios and jump factors, the Davisson-Kirchner ratios and K shell oscillator strength values were estimated experimentally. The measured parameters were compared with the theoretical calculated values. It is observed that the K shell photoelectric cross section at the K-edge and K shell oscillator strength values of an element are affected by the chemical environment of material while the K shell absorption jump ratio, K shell absorption jump factor and Davisson-Kirchner ratio are not affected by the chemical environment of material for the present samples. To the best of our knowledge, the chemical effects on the Davisson-Kirchner ratio and K shell oscillator strength have not been discussed for any element by now.

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Total and K-shell photoeffect cross sections at K-edges of Cu, Zr, Ag, Sn, Ta, Au, and Pb

Cited by 9 publications

References 1 publication

Measurement of the x-ray mass attenuation coefficient of silver using the x-ray-extended range technique

Measurement of the x-ray mass attenuation coefficient of silver using the x-ray-extended range technique

High-accuracy measurement of mass attenuation coefficients and the imaginary component of the atomic form factor of zinc from 8.51 keV to 11.59 keV, and X-ray absorption fine structure with investigation of zinc theory and nanostructure

Chemical effect on theKshell absorption parameters of some selected cerium compounds

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