N-shell ionization of tungsten by proton impact

Tittel, H. O.; Bell, F.

doi:10.1007/bf01408083

Cited by 3 publications

(6 citation statements)

References 23 publications

(12 reference statements)

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“…They mentioned that their theoretical values are in good agreement with the experimental data. On the other hand, the RPWBA and the RPWBA-BC calculations of Chen and Crasemann [10] and all the present BEA models differ substantially from both experimental and theoretical values of Tittel and Bell [5] in low-energy and high-energy region. In order to see the reason for discrepancy between the SCA and their RPWBA values, Chen and Crasemann [10] performed the RPWBA calculations with the screened hydrogenic wave functions (RPWBA-SH).…”

Section: Resultscontrasting

confidence: 59%

“…They mentioned that their theoretical values are in good agreement with the experimental data. On the other hand, the RPWBA and the RPWBA‐BC calculations of Chen and Crasemann and all the present BEA models differ substantially from both experimental and theoretical values of Tittel and Bell in low‐energy and high‐energy region.…”

Section: Resultsmentioning

confidence: 99%

“…There has been reported only one experimental study on N-shell ionization cross sections by protons. Tittel and Bell [5] measured 4d-shell ionization cross sections of W by proton impact. Their experimental results are plotted in Figure 6 and compared with various theoretical models.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the number of measurements for N‐shell ionization is scarce. To the author's knowledge, only one experiment has been reported . This is because of small fluorescence yields of N‐subshell vacancy and complex nature of N‐X‐ray spectra due to existence of seven subshells.…”

Section: Introductionmentioning

confidence: 99%

“…[8] However, most of calculations have been made for K-shell, L-shell, and M-shell electrons. For N-shell ionization, only one SCA calculations [5] and two PWBA calculations [9,10] have been performed, but there is no BEA calculation.…”

Section: Introductionmentioning

confidence: 99%

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N‐shell ionization cross sections by proton impact in the BEA

Mukoyama

2018

X-Ray Spectrometry

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The N‐subshell ionizations cross sections of heavy elements by proton impact have been calculated in the binary‐encounter approximation. The momentum distribution of target electrons is taken into account by the use of the nonrelativistic and relativistic hydrogenic models and the Hartree–Fock–Roothaan and the relativistic Hartree–Fock–Roothaan methods. The obtained subshell ionization cross sections are compared with the experimental data and other theoretical calculations. The electronic relativistic effect and the wave‐function effect on N‐shell ionization cross sections are discussed.

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Section: Resultscontrasting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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N‐shell ionization cross sections by proton impact in the BEA

Mukoyama

2018

X-Ray Spectrometry

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Scaled proton ionization cross sections in the Born approximation

McGuire¹

1980

Phys. Rev. A

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Using the generalized oscillator strength formulation of the Born approximation, proton ionization cross sections were calculated for a large sample of subshells of atoms throughout the periodic table. The results are presented in the form of scaled cross sections for all subshells up to the 6p. Comparison with measurements shows reasonable agreement (better than a factor of 2), with some exceptions, for the proton energy range studied. The scaled cross sections presented herein are limited, in general, to proton energies greater than 184 times the subshell ionization energy.

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Relativistic calculation of atomicN-shell ionization by protons

Chen

Crasemann

1986

Phys. Rev. A

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Relativistic plane-wave Born-approximation calculations of cross sections for S-shell ionization of 838i and 9$U by protons with incident energies from 0.02 to 5 MeV are reported. The calculations were carried out by using D}irac-Hartree-Slater wave functions.Binding-energy change andCoulomb deflection were taken into account. The relativistic cross sections are compared with values from nonrelativistic Hartree-Slater wave functions to study the effects of relativity. A test calculation with hydrogenic wave functions yields very different results. The only available measurements (for 7~%), revised with a corrected 4d fluorescence yield, agree with present theoretical predictions for El &0. 1 MeV but fall below theory by a factor of 6 above El --0.4 MeV. This glaring discrepancy invites further investigation.

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N-shell ionization of tungsten by proton impact

Abstract: The cross section for tungsten N-shell ionization by proton impact has been measured between 0.015 and 2.8MeV. The measurements are compared with results from the semiclassical approach SCA), which has been extended to 4d ionization.

Cited by 3 publications

References 23 publications

N‐shell ionization cross sections by proton impact in the BEA

N‐shell ionization cross sections by proton impact in the BEA

Scaled proton ionization cross sections in the Born approximation

Relativistic calculation of atomicN-shell ionization by protons

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