Measurement of L X-ray production cross sections by impact of proton beams on Hf, Ir, and Tl

Miranda, J.; Murillo, G.; Méndez, B.; López-Monroy, J.; Aspiazu, J.; Villaseñor, P.; Pineda, J.C.; Reyes-Herrera, Juan

doi:10.1016/j.nimb.2013.08.045

Cited by 16 publications

(4 citation statements)

References 33 publications

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“…The database used in this work relies mainly on the recent compilations of Miranda and Lapicki . In addition to this, we selected an additional number of data from other works . These experimental data are not reported in the paper of Miranda and Lapicki .…”

Section: Semi‐empirical Formulaementioning

confidence: 99%

Three dimensional (Z‐dependence), collective and individual semi‐empirical formulae for L X‐ray production and ionization cross section by protons impact within corrected ECPSSR theory and updated experimental data: a review

et al. 2016

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In this paper we propose a new three dimensional semi‐empirical formulae for the deduction of L X‐ray production and ionization cross sections by introducing the dependence on the atomic number of the target, noted as ‘Z‐dependence’. The data are also fitted collectively and separately (for each element) by analytical functions to calculate semi‐empirical cross sections. For this purpose, the corrected ECPSSR model (noted as eCPSSR) and the published experimental data of Lα, Lβ and Lγ X‐ray production and L1, L2 and L3 ionization cross sections in the period (1950–2014) are combined to calculate the semi‐empirical ones for a wide range of elements by proton impact. The semi‐empirical cross sections (for the three x‐rays lines Lα, Lβ, Lγ and the three sub‐shells L1, L2, L3) are then deduced by fitting the available experimental data normalized to their corresponding theoretical values (using the eCPSSR model) giving a better representation of the experimental data for the individual interpolation. At last, a comparison is made between the three semi‐empirical formulae reported in this work. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Semi‐empirical Formulaementioning

confidence: 99%

Three dimensional (Z‐dependence), collective and individual semi‐empirical formulae for L X‐ray production and ionization cross section by protons impact within corrected ECPSSR theory and updated experimental data: a review

et al. 2016

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“…The measurement of emitted x-rays from targets has resulted in major advances in radiation physics [1], plasma physics [2], atomic and nuclear physics [3], and the particle-induced x-ray emission (PIXE) technique [4,5]. Thus far, the PIXE method has used light ions such as protons or alphas [6][7][8][9][10][11][12][13]; however, there is an increasing interest to employ heavy ions since their cross sections are larger and have, thereby, better sensitivity [14]. Nevertheless, this potentiality is discouraged by discrepancies observed between the theories and experiments.…”

Section: Introductionmentioning

confidence: 99%

Understanding the mechanisms of L-shell x-ray emission from Os atoms bombarded by 4–6 MeV/u fluorine ion

Chatterjee¹,

Kumar²,

Kumar³

et al. 2022

Phys. Scr.

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The L-subshell ionization mechanism is studied in an ultra-thin Os target bombarded by 4-6 MeV/u fluorine ions. Multiple ionization effects are considered through the change of fluorescence and Coster-Kronig yields while determining L-subshell ionization cross sections from L X-ray production cross sections. The present experimental values are compared with various theoretical approximations: (i) the relativistic semi-classical approximation (RSCA), (ii) the shellwise local plasma approximation (SLPA), and (iii) the ECUSAR theory. We also take into account the vacancy sharing among the subshells by the coupled-states model (CSM) and the electron capture (EC) by a standard formalism. We find that the ECUSAR-CSM-EC describes the measured excitation function curves the best. However, the theoretical calculations are still about a factor of two smaller than the measured values even though the recent fluorescence and Coster-Kronig yields are considered. Hence, a re-evaluation of these parameters is a challenge for the theoretical works. Whatsoever, this work leads to demonstrate that in the present energy range the heavy-ion induced inner-shell ionization of the heavy atoms can be understood by combining the direct Coulomb ionization, the electron capture, and the vacancy sharing among subshells, together with optimizing the atomic parameters. Optimization of the atomic parameters shows that our experimental results agree with theoretical vacancy production theories if the L1 fluorescence yield is nearly doubled. Such a optimization is validated by the proton induced L-shell ionization data of uranium atoms.

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“…e detailed knowledge of X-ray emission provides important information to understand the charged ion-atom interaction mechanism and to test relevant ionization theories [1][2][3][4]. Furthermore, accurate parameters of X-ray are required for the application of trace element analysis known as particle-induced X-ray emission (PIXE), which has application in many fields, such as environmental studies, archaeology, biomedicine, and forensic science [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Energy Dependency of Proton-Induced Outer-Shell Multiple Ionization for ₄₈Cd and ₄₉In

et al. 2021

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L subshell X-rays of 48Cd and 49In have been measured for the impact of protons with energies from 75 to 250 keV. Obviously, it is found that Lγ2 (abbreviation Lγ2,3 for 48Cd and Lγ2,3,4 for 49In) X-ray emission is enhanced in comparison with Lγ1 X-ray emission. The relative intensity ratios of Lγ2 to Lγ1 X-ray are larger than the atomic data and increase with decreasing proton energy. This is caused by the multiple ionization of outer-shell electrons. To verify this explanation, the enhancements for relative intensity ratio of Lι and Lβ2 to Lα X-ray in experiments are discussed, and the direct ionization cross sections of 4d, 5s, and 5p electrons are calculated using BEA theory.

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Measurement of L X-ray production cross sections by impact of proton beams on Hf, Ir, and Tl

Cited by 16 publications

References 33 publications

Three dimensional (Z‐dependence), collective and individual semi‐empirical formulae for L X‐ray production and ionization cross section by protons impact within corrected ECPSSR theory and updated experimental data: a review

Three dimensional (Z‐dependence), collective and individual semi‐empirical formulae for L X‐ray production and ionization cross section by protons impact within corrected ECPSSR theory and updated experimental data: a review

Understanding the mechanisms of L-shell x-ray emission from Os atoms bombarded by 4–6 MeV/u fluorine ion

Energy Dependency of Proton-Induced Outer-Shell Multiple Ionization for ₄₈Cd and ₄₉In

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Measurement of L X-ray production cross sections by impact of proton beams on Hf, Ir, and Tl

Cited by 16 publications

References 33 publications

Three dimensional (Z‐dependence), collective and individual semi‐empirical formulae for L X‐ray production and ionization cross section by protons impact within corrected ECPSSR theory and updated experimental data: a review

Three dimensional (Z‐dependence), collective and individual semi‐empirical formulae for L X‐ray production and ionization cross section by protons impact within corrected ECPSSR theory and updated experimental data: a review

Understanding the mechanisms of L-shell x-ray emission from Os atoms bombarded by 4–6 MeV/u fluorine ion

Energy Dependency of Proton-Induced Outer-Shell Multiple Ionization for 48Cd and 49In

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Energy Dependency of Proton-Induced Outer-Shell Multiple Ionization for ₄₈Cd and ₄₉In