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Yu, Yang; McNeir, M.R.; Weathers, D.L.; Duggan, J.L.; McDaniel, F. D.; Lapicki, G.

doi:10.1103/physreva.44.5702

Cited by 11 publications

(5 citation statements)

References 30 publications

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“…Also not shown in Fig. 7 are the post-1989 data of Mehta et al, 67 which-although for 66 Dy in close agreement with Ref. 8-are for 47 Ag data as much as a factor of 2 lower than empirical cross sections 8 while at the lowest for the 79 Au datum almost equally larger than gold cross sections cited in Ref.…”

Section: The Eecpsshsr Theorysupporting

confidence: 56%

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The status of theoretical K‐shell ionization cross sections by protons

Lapicki

2005

X-Ray Spectrometry

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The accuracy of PIXE analysis depends on inner-shell ionization cross sections that are often calculated in the ECPSSR theory which accounts with analytical functions for the energy (E) loss and Coulomb (C) deflection of the projectile plus for the perturbed-stationary state (PSS) and relativistic (R) nature of the target's inner shell. Although the ECPSSR is within 10% overall agreement with the K-shell data -as the proton energy falls below 0.1 to 1 MeV, respectively, in ionization of light-to heavy-target atoms -the ECPSSR increasingly overestimates the empirical database of Paul and Sacher (1989). Except for an enhancement of this overestimate at low energies, a modified ECPSSR based on the Chen-Crasemann (1985, 1989) plane wave Born approximation -evaluated with the exact limits for the momentum transfers and the Dirac-Hartree-Slater wavefunctions -yields cross sections that remain within 10% of the data and the ECPSSR theory. Codes that use only the exact limits instead of the energy-loss function are confirmed to be improper for evaluation of the ECPSSR. Further enhancement of the cross sections at the low energies is limited to light target atoms after the function derived in the separated atom approach to account for the PSS effect is joined with an expression obtained in the united atom limit. An empirical database, updated with cross sections from post-1989 publications, is normalized to the modified ECPSSR theory and various forms of the Coulomb deflection factor are revisited.

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Section: The Eecpsshsr Theorysupporting

confidence: 56%

“…7 against the backdrop of the similarly normalized empirical reference cross sections. 8 Not displayed are the data of Bak and Bak, 65 Yu et al, 66,72,83 Lin et al 70 and Chen et al 77 that fall in a narrow range around D 1 where they generally agree with both Ref. 8 and the eECusPSShsR theory.…”

Section: The Eecpsshsr Theorymentioning

confidence: 69%

The status of theoretical K‐shell ionization cross sections by protons

Lapicki

2005

X-Ray Spectrometry

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“…The absolute K x-ray production cross sections for the Na target are reported for the proton energy range investigated here. (We have recently seen work by Yu et al [27], who have measured the E x-rayproduction cross sections for low-Z elements, including Na, using proton beams. Their results for Na, Mg, and Al, in the energy range investigated here are in good agreement with our results.…”

Section: Molecular Orbital (Mo) Approachmentioning

confidence: 99%

K-shell-ionization cross sections for low-Zelements (11≤Z≤22) by protons in the energy range 0.5–2.5 MeV

Tribedi

Tandon

1992

Phys. Rev. A

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EC-shell-ionization cross sections for Na, Mg, Al, Si, Cl, K, Ca, and Ti by protons in the energy range 0.5 -2.5 MeV have been measured using thin targets. Measurements have also been performed for thin targets of Fe, Ni, and Cu at a few energies. The energy range of protons for these targets corresponds to the reduced velocity {U1/U2&) range 0.2-1.1, in which the cross sections are very sensitive to the increased binding energy and the Coulomb-deflection effects. The measured ionization cross sections are compared with the predictions of the theory based on the perturbed-stationary-state approach including the Coulomb-deflection, energy-loss, and relativistic corrections. The data have been scaled according to various scaling laws to test the validity of the universal nature of the various Coulomb ionization theories based on the plane-wave Born approximation, the binary-encounter approximation, and the simplified semiclassical approximation model as given by La:gsgaard, Andersen, and Lund [in Proceed ings of the Tenth International Conference on the Physics ofElectronic and Atomic Collisions, edited by G. Watel (North-Holland, Amsterdam, 1978), p. 353]. The measured data have also been compared with the calculations of Montenegro and Siguad [J. Phys. B 18, 299 (1985)] based on the theory of lscr molecular-orbital ionization.

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“…因此离子与原子碰撞作为研究X射线手段目前已成为重要的研究课题. 在实验方面对于较轻离子如质子, He离子入射激发的靶原子X射线的发射截面已积累了丰富的数据, 包括入射离子的速度范围, 靶原子的原子序数等 [19][20][21] , 而高电荷态重离子入射的碰撞系统, 由于相互作用的物理过程及实验现象等比较复杂, 特别是中能区, 由于加速器和现有理论分析的限制系统研究相对较少, 原子数据不完整, 精度不高, 天体元素X射线数据的研究更为匮乏 [22,23] . 另一方面, 考虑到在浩瀚的宇宙中C, Fe和Ni等15种元素的丰度最高 [24] , 这些元素及其不同电荷态离子的K α 和K β 射线谱的强度, 展宽和红移为星系核, X射线双星系统, 超新星演化研究提供了重要依据.…”

Section: 常见原子的特征X射线(k L壳层x射线)unclassified

K-X rays induced by helium-like C ions in thick target atoms of different metals

Mei,

Zhang,

Zhou

et al. 2024

Acta Phys. Sin.

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The physical process and experimental phenomena of the interaction between highly charged heavy ions and atoms are very complex, particularly in the intermediate energy region, because of the limitation of accelerator and existing theoretical analysis, the systematic research is relatively few, the atomic data are incomplete and the accuracy is not high, and the research of celestial element X-ray data is more scarce and the research of X-ray data of celestial elements is even more scarce. Helium-like C ions with 15~55 MeV kinetic energy provided by the HI-13 MV series accelerator of the China Institute of Atomic Energy are used to bombard Fe, Ni, Nb and Mo thick targets. The HpGe detectors are used to measure the K X ray emission, and the corresponding K X ray emission cross sections are obtained. Due to the different ionization degrees of the shell layers of various target atoms, the branching intensity ratio of Kβ to Kα X rays emitted by Helium-like C ions interacting with Fe and Ni target atoms decreases with the increase of the kinetic energy of the incident ions, while the branching intensity ratio of KX rays emitted by Nb and Mo target atoms does not change significantly. The K X ray emission cross section of target atom is calculated by using the thick target cross section formula, and compared with the results of different theoretical models and proton. The results show that with the increase of the kinetic energy of helium-like C ions, the total emission cross section of the Kβ and Kα X ray emitted from Fe and Ni target atoms are most consistent with the BEA correction model considering multiple ionization, and the total emission cross section of Kβ and Kα X ray emitted from Nb and Mo target atoms are most close to the theoretical values of PWBA model. When the energy of proton is the same as that of single nucleon C ion, the cross section of K X ray produced by proton is about 3 orders of magnitude smaller than that produced by helium-like C ion.

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K-shell x-ray-production cross sections inC6,O

Cited by 11 publications

References 30 publications

The status of theoretical K‐shell ionization cross sections by protons

The status of theoretical K‐shell ionization cross sections by protons

K-shell-ionization cross sections for low-Zelements (11≤Z≤22) by protons in the energy range 0.5–2.5 MeV

K-X rays induced by helium-like C ions in thick target atoms of different metals

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