Measurements of fluorescence and Coster-Kronig yields for 66 Dy using synchrotron radiation induced selective photoionization method

Kaur, Rajnish; Kumar, Anil; Czyzycki, Mateusz; Migliori, Alessandro; Karydas, A. G.; Puri, S.

doi:10.1016/j.nimb.2017.06.026

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…Further on, the probabilities,

normalη ̅_{L_{j} M_{i}}

, evaluated (Equation 6) using the DHS model‐based L j (j = 1–3) subshell CK yields have been listed in Table . These values are found to agree well with those calculated using the measured values of the L j subshell CK yields for 66 Dy recently reported by Kaur et al…”

Section: Evaluation Methodsmentioning

confidence: 99%

Cascade M_i (i = 1–5) subshell X‐ray emission at incident photon energies across the L_j (j = 1–3) subshell absorption edges of ₆₆Dy

et al. 2018

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The total M shell and the Mk (k = ξ, αβ, γ, m) X‐ray production cross sections for 66Dy have been measured at incident photon energies across its Lj (j = 1–3) subshell absorption edge energies, ranging 7.8–9.2 keV. This study aims to investigate the evolution of the probability for cascade decay of Lj subshell vacancies as the tunable incident energy ionizes progressively different 66Dy Lj subshells. The experimental X‐ray production cross sections have been compared with theoretical ones calculated using the nonrelativistic Hartree–Fock–Slater (HFS) model‐based photoionization cross sections; three sets of the X‐ray emission rates, fluorescence and Coster–Kronig yield based on the nonrelativistic Hartree–Slater (NRHS) model, Dirac–Hartree–Slater (DHS) model and Dirac–Fock (DF) model; the Lj (j = 1–3) subshell to the Mi (i = 1–5) subshell vacancy transfer probabilities evaluated in the present work. Presently measured total M shell and the Mαβ X‐ray production cross sections are found to be significantly lower than the theoretical ones evaluated using physical parameters based on the relativistic Dirac–Fock/Dirac–Hartree–Slater model calculations, whereas a much better agreement is observed with respect to the NRHS model‐based calculations; however, the measured X‐ray production cross sections are still systematically lower than the NRHS values.

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“…Further on, the probabilities,

normalη ̅_{L_{j} M_{i}}

Section: Evaluation Methodsmentioning

confidence: 99%

Cascade M_i (i = 1–5) subshell X‐ray emission at incident photon energies across the L_j (j = 1–3) subshell absorption edges of ₆₆Dy

et al. 2018

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“…The trade-off between Auger and XRF resides in the complexity of the spectra generated and, hence, the availability of a priori information required for a proper separation of the contributions originating from the different L subshells. For XRF-based works, mostly, energy-dispersive detectors were used 2,4,[31][32][33][34][35]45,46,58 but wavelength-dispersive spectrometers for measurements on selected X-ray emission lines were used as well. 9,10…”

Section: Ck Transition Factorsmentioning

confidence: 99%

Experimental determination of the gadolinium L subshells fluorescence yields and Coster‐Kronig transition probabilities

et al. 2022

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The L subshell Coster‐Kronig (CK) transition factors of Gd have been experimentally determined by means of two different experimental approaches and compared to available literature data. On the one hand, reference‐free X‐ray fluorescence (XRF) analysis using an energy‐dispersive detector was applied. This method permitted in addition to determine the L subshell fluorescence yields since the absolute incident and emitted X‐ray photon flux can be determined. On the other hand, a wavelength‐dispersive spectrometer based on a modified von Hamos geometry using a full cylinder highly annealed pyrolithic graphite crystal was used for an experimental validation of the CK transition factors in an independent experiment. The use of this high energy resolution spectrometer allowed thanks to the capability to better discriminate the different X‐ray emission lines to validate the reference‐free XRF results. For both experiments, the use of calibrated instrumentation enabled the provision of a reliable uncertainty budget on the results obtained.

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“…Several investigators have measured the L X-ray intensity ratios, L subshell fluorescence yield and Coster-Kronig transition parameters by exciting the target with gamma radiation, charged particles and synchrotron radiation. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Singh et al [4] have measured average L shell fluorescence yields for some elements in the range 56 ≤ Z ≤ 92. Ertugrul et al [5] have measured average 2p subshells fluorescence yields for the elements 60 ≤ Z ≤ 90.…”

Section: Introductionmentioning

confidence: 99%

“…Several investigators have determined L subshell fluorescence yield and Coster-Kronig transition parameters for medium and high Z targets using synchrotron radiation. [15][16][17][18][19] Barrea et al [15] have determined the L subshell fluorescence yields and Coster-Kronig transition probabilities for Ba target by selective excitation method. They suggested the need of more accurate fluorescence cross-sections, either experimental or theoretical, to improve the Coster-Kronig and fluorescence yields' determinations.…”

Section: Introductionmentioning

confidence: 99%

“…They suggested the need of more accurate fluorescence cross-sections, either experimental or theoretical, to improve the Coster-Kronig and fluorescence yields' determinations. Kaur et al [16] have determined the fluorescence and Coster-Kronig yields for Dy using synchrotron radiation. Guerra et al [17] have determined experimental and theoretical L shell fluorescence yields and Coster-Kronig parameters for nickel target.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of L subshell fluorescence yield ratios of some high Z elements by selective excitation method

et al. 2020

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The L1, L2 and L3 subshells of Hf, Ta and Re atoms have been excited selectively by using microprobe XRF beam line, Indus‐2, RRCAT, India. The consequent characteristic L X‐ray photons, emitted from the targets due to creations of vacancies in L subshells, are measured using silicon drift detector (X‐123) spectrometer. As the energy of synchrotron radiation increases, the contribution of characteristic L X‐ray intensity increases. The advantage of the increase in the intensity of the characteristic L X‐ray photons with an increase in the energy of synchrotron radiation has been used to determine the L subshell fluorescence yield ratios of Hf, Ta and Re atoms by adopting the selective excitation method. The measured ratios of L subshell fluorescence yield have been compared with theoretical and other experimental values.

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Measurements of fluorescence and Coster-Kronig yields for 66 Dy using synchrotron radiation induced selective photoionization method

Cited by 7 publications

References 30 publications

Cascade M_i (i = 1–5) subshell X‐ray emission at incident photon energies across the L_j (j = 1–3) subshell absorption edges of ₆₆Dy

Cascade M_i (i = 1–5) subshell X‐ray emission at incident photon energies across the L_j (j = 1–3) subshell absorption edges of ₆₆Dy

Experimental determination of the gadolinium L subshells fluorescence yields and Coster‐Kronig transition probabilities

Measurement of L subshell fluorescence yield ratios of some high Z elements by selective excitation method

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Measurements of fluorescence and Coster-Kronig yields for 66 Dy using synchrotron radiation induced selective photoionization method

Cited by 7 publications

References 30 publications

Cascade Mi (i = 1–5) subshell X‐ray emission at incident photon energies across the Lj (j = 1–3) subshell absorption edges of 66Dy

Cascade Mi (i = 1–5) subshell X‐ray emission at incident photon energies across the Lj (j = 1–3) subshell absorption edges of 66Dy

Experimental determination of the gadolinium L subshells fluorescence yields and Coster‐Kronig transition probabilities

Measurement of L subshell fluorescence yield ratios of some high Z elements by selective excitation method

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Cascade M_i (i = 1–5) subshell X‐ray emission at incident photon energies across the L_j (j = 1–3) subshell absorption edges of ₆₆Dy

Cascade M_i (i = 1–5) subshell X‐ray emission at incident photon energies across the L_j (j = 1–3) subshell absorption edges of ₆₆Dy