L-shell ionization in Au by O5+-and Ni5+-ion impact

Goyal, D. P.; Braich, J.S.; Murlithar, S.; Singh, B. P.; Verma, H.R.

doi:10.1007/bf01437064

Cited by 6 publications

(2 citation statements)

References 33 publications

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“…The spectra from Si(Li) and SBD detectors were stored through the CAMAC system into the VAX computer at NSC and into the multichannel analyser (MCA) at IOP. More details of the experimental set-up have been discussed elsewhere (Braich et al 1996a, b, Goyal et al 1995.…”

Section: Methodsmentioning

confidence: 99%

M-shell x-ray production cross section measurements in Pb and Bi due to the impact of protons and nickel ions

Braich¹,

Verma²,

Verma³

1997

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

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M-shell x-ray production cross sections in Pb have been measured using 58-82 MeV Ni q+ (q = 5, 6) ions and those in Bi by 1-5 MeV protons and 58-82 MeV Ni q+ ions (q = 5, 6). The experimental results have been compared with the predictions of the planewave Born approximation (PWBA) and with the calculations of the perturbed stationary state theory (ECPSSR) accounting for the energy loss (E), Coulomb deflection (C) and relativistic (R) effects. The present results of proton impact on bismuth have also been compared with the experimental data available from other investigations. To the best of our knowledge, the M-shell x-ray production cross sections in Pb and Bi by Ni-ion impact are reported here for the first time. Good agreement of the present results with the predictions of the ECPSSR theory has been observed for the total M x-ray cross sections in Bi due to proton impact while discrepancies to a factor of 1.5-2.5 in the case of total M x-ray cross sections have been observed between the present experimental and theoretical (PWBA and ECPSSR, respectively) results for Pb and Bi in the case of Ni-ion impact. These discrepancies between the experimental and theoretical results could be attributed to the effect of multiple ionization on the x-ray emission probabilities. If the modified value of the average fluorescence yield accounting for the outer-shell multiple ionization is used, the theoretical results of total M-shell x-ray cross sections based on the PWBA theory show fair agreement with the experimental results (within experimental uncertainties) while the ECPSSR theory is found to underestimate the experimental results by about 40% for both Pb and Bi in the case of Ni-ion impact. Furthermore, the Mαβ, Mγ and (M 3 O 1,4,5 + M 2 N 4 ) x-ray cross sections have been evaluated experimentally for both Pb and Bi. The comparison of these results with the corresponding theoretical estimates have been done only for Pb as the emission rates for various M x-ray transitions of Bi are not available in the literature. The comparison of the Mαβ cross sections show fair agreement with the PWBA-based theoretical values, while there are discrepancies of a factor of 10 and 20 in the cases of Mγ and (M 3 O 1,4,5 + M 2 N 4 ) x-ray transitions.

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Section: Methodsmentioning

confidence: 99%

M-shell x-ray production cross section measurements in Pb and Bi due to the impact of protons and nickel ions

Braich¹,

Verma²,

Verma³

1997

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

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show abstract

“…The Kα X-ray yield of thick targets for alpha particles ranging from 1 to 100 MeV was reported by Castiglioni et al (1992). Moreover, the PIXE work using heavy ions is not yet well established as only a few measurements on the K and L X-ray production cross-sections, in different selected elements, with various selected projectiles, are available (Mokler et al 1970, Datz et al 1971, Mukoyama et al 1980, O'Kelley et al 1984, Andrews et al 1985, Tanis et al 1985, Mehta et al 1993, Wang et al 1993, Tribedi et al 1993, Goyal et al 1995, Semaniak et al 1995, Padhi et al 1996, Baraich et al 1997, Bogdanovic et al 1997). Moreover, the PIXE work using heavy ions is not yet well established as only a few measurements on the K and L X-ray production cross-sections, in different selected elements, with various selected projectiles, are available (Mokler et al 1970, Datz et al 1971, Mukoyama et al 1980, O'Kelley et al 1984, Andrews et al 1985, Tanis et al 1985, Mehta et al 1993, Wang et al 1993, Tribedi et al 1993, Goyal et al 1995, Semaniak et al 1995, Padhi et al 1996, Baraich et al 1997, Bogdanovic et al 1997).…”

Section: Choice Of Beam/pixe Using Heavy Ion Beamsmentioning

confidence: 99%