<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>L</mml:mi></mml:math>-subshell ionization of Au, Tl, Pb, Bi, Th, and U by protons

Leite, C. V. Barros; Faria, N. V. de Castro; Pinho, A. G. de

doi:10.1103/physreva.15.943

Cited by 46 publications

(8 citation statements)

References 28 publications

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“…Most publications dealing with L-shell excitation investigate the direct ionization process by means of light particle bombardment. The comparison of recent experimental results -p and 4He bombardment of Ag, Ta and Au [15][16][17][18][19][20] -with PWBA model [21] calculations, including binding and Coulomb deflection corrections PWBA(BC) [5], shows a satisfactory agreement for incidence energies of about 1-5 MeV/amu. At lower energies, however, we found the PWBA(BC) theory to underestimate the experimental data.…”

Section: Introductionmentioning

confidence: 55%

“…At the thin target measurements the main sources of error consist in a 10% efficiency uncertainty of the X-ray detector used as well as 5-8 % target inhomogenities important in the case of N and Ne impact. The accuracy of the X-ray cross sections observed from thick target yields is mainly limited by the average uncertainties of the stopping power data [29] 6 3.91(+2) 10 2.26(+3) 13 5.39(+3) 16 9.77(+3) 20 1.31 (+4) 6 1.00 10 1.20(+1) 13 3.50(+l) 16 8.80(+l) 20 1.83(+2) a 1.20(+1)=1.20.10 +1…”

Section: Methodsmentioning

confidence: 99%

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L-shell vacancy production in Ag, Ta and Au for incident ionsZ 1?10 in the energy range of 0.125?4 MeV/amu

et al. 1981

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Absolute Ag, Ta and Au L-shell X-ray cross sections were measured using protons, 4He, 14N as well as 2~ ions in the energy range of 0.125-4 MeV/amu. By means of single-hole fluorescence yields experimental ionization cross sections were deduced and compared with calculations according to the corrected PWBA model -PWBA(BPCR). With decreasing asymmetry of the collision system the experimental cross sections exceed the predictions of the direct ionization theory. This is caused by an increasing contribution of a competing KL charge exchange mechanism which was investigated in detail for Ne + Ag. The Lapicki and Losonsky capture model was found to fail at energies E < 1 MeV/amu because adiabatic relaxation effects in the projectile K-shell become important. An estimation by means of the Nikitin model led to more physically comprehensible results at the lowest ion velocities investigated. 05

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Section: Introductionmentioning

confidence: 55%

Section: Methodsmentioning

confidence: 99%

L-shell vacancy production in Ag, Ta and Au for incident ionsZ 1?10 in the energy range of 0.125?4 MeV/amu

et al. 1981

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“…Our results, as well as the few existing data from other laboratories (Barros Leite et al 1977, Budnar et al 1984, Amirabadi et al 1997, are compared with the theoretical predictions by plotting the ratios between the experimental (σ exp ) and the predicted (σ th ) cross sections versus the relativistic reduced velocity parameter ξ R L . Data reported on production cross sections (Amirabadi et al 1997) have been converted to ionization cross sections by making use of the same procedure and the same parameters used for our own data, in order to compare with the other data treated in the same way.…”

Section: Cross Section Valuesmentioning

confidence: 95%

“…However, in a review by Jitschin (1990), no clear evidence about the better basis came out. Thus we prefer to adopt the Krause's basis, that has been more widely used, and, in particular, has been used by two of the three authors who have reported data on these elements (Budnar et al 1984, Barros Leite et al 1977.…”

Section: Ionization Cross Sectionsmentioning

confidence: 99%

“…Data reported on production cross sections (Amirabadi et al 1997) have been converted to ionization cross sections by making use of the same procedure and the same parameters used for our own data, in order to compare with the other data treated in the same way. Leite et al (1977); •, Budnar et al (1984); , Amirabadi et al (1997).…”

Section: Cross Section Valuesmentioning

confidence: 99%

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Adiabatic L-shell ionization of Hg and Tl by proton and He ion impact

Cesare¹,

Murolo²,

Perillo³

et al. 1998

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

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L-shell x-ray production cross sections by proton and 4 He ion impact on Hg and Tl (of great importance from the biological point of view, owing to their moderate toxicity properties) have been measured in the energy ranges 0.3 E p 2.6 MeV and 0.7 E4 He 1.8 MeV, respectively. L-subshell ionization cross sections have been extracted and arranged, together with the few existing data from other laboratories, in an analysis aimed at testing the performance of various theoretical approximations in the description of the ionization process. The disagreement observed at low values of the reduced velocity parameter ξ R L between the data and the predictions of the ECPSSR model is reduced significantly by using a united-atom approximation in the treatment of the binding correction, suggested by our group (ECPSSR-UA). The remaining discrepancies, mostly for the L 1 -subshell, are strongly reduced by replacing the screened hydrogen-like wavefunctions with the more realistic Dirac-Hartree-Slater ones. In the case of 4 He ions, especially for the L 2 -subshell, a more refined Coulomb deflection correction and/or more sophisticated coupled-channels calculations are also needed.

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Impact Ionization by Fast Projectiles

Hippler

1984

Progress in Atomic Spectroscopy Part C

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L-subshell ionization of Au, Tl, Pb, Bi, Th, and U by protons

Cited by 46 publications

References 28 publications

L-shell vacancy production in Ag, Ta and Au for incident ionsZ 1?10 in the energy range of 0.125?4 MeV/amu

L-shell vacancy production in Ag, Ta and Au for incident ionsZ 1?10 in the energy range of 0.125?4 MeV/amu

Adiabatic L-shell ionization of Hg and Tl by proton and He ion impact

Impact Ionization by Fast Projectiles

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