The status of theoretical L-subshell ionization cross sections for protons

Lapicki, G.

doi:10.1016/s0168-583x(01)00987-9

Cited by 93 publications

(74 citation statements)

References 46 publications

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“…Compilations of these data [1][2][3][4][5] show generally good (i.e., within the claimed experimental uncertainties) agreement of K-and total L-shell ionization data with the ECPSSR theory that goes beyond the first Born approach [6,7] by accounting for the energy loss ͑E͒ and Coulomb-deflection ͑C͒ of the projectile, and for perturbed-stationary state (PSS) and relativistic ͑R͒ nature of the target both for direct ionization [8] and electron capture [9]. However, even with protons, there are systematic deviations in the prediction of L-subshell ionization cross sections [5,10].…”

Section: Introductionmentioning

confidence: 95%

“…Tables III and IV show multiple ionization factors MI, defined as the ratio of L-subshell ionization cross section extracted without any multiple ionization correction to the ones that were extracted with the multiple ionization accounted for as given by Eqs. (8)- (10). Following ionization, electrons in ionized atoms cascade along a variety of pathways depending strongly on the primary patterns of multiple ionization of an inner shell and outer shells [28].…”

Section: Extraction Of X-ray Production and L-subshell Ionizationmentioning

confidence: 99%

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Effects of multiple ionization and intrashell coupling inL-subshell ionization by heavy ions

et al. 2004

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L-subshell ionization cross sections are extracted from measured L␣, L␤, L␥, L␥ 1 , L␥ 23 , and L␥ 44 x-ray production cross sections in thin targets of 75 Re, 78 Pt, and 79 Au bombarded by 4 -8 MeV C 3+ ions. For each projectile energy, using the fluorescence and Coster-Kronig yields recently recommended by Campbell with an amendment for multiple ionization effects, a mutually consistent set of ionization cross sections is extracted from L␣ and six pairs of other L-line x-ray production cross sections. Extracted L 1 -, L 2 -, L 3 -ionization cross sections are compared with the predictions of the ECPSSR theory-which accounts for the energy ͑E͒ loss and Coulomb ͑C͒ deflection of the projectile as well as for perturbed-stationary state (PSS) and relativistic ͑R͒ nature of L subshells-and its modification, ECUSAR-IS. In the ECUSAR-IS theory, the PSS effect is calculated with a united and separated atom (USA) treatment and the intrashell (IS) coupling is accounted for by multiplicative factors of Sarkadi and Mukoyama normalized so that the sum of L-subshell ECUSAR-IS cross sections equals ECUSAR L-shell ionization cross section without the IS correction. Further improvement of this theory to account for better wave functions in its evaluation is made by scaling it with ratios of DiracHartree-Slater cross sections to the screened hydrogenic formulas used in the ECPSSR theory. Very good agreement is obtained with L 2 and L 3 ionization data. For the L 1 subshell, the data are in good agreement with the ECPSSR theory but are by factors of 2 to 3 above the results of its modifications.

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Section: Introductionmentioning

confidence: 95%

Section: Extraction Of X-ray Production and L-subshell Ionizationmentioning

confidence: 99%

Effects of multiple ionization and intrashell coupling inL-subshell ionization by heavy ions

et al. 2004

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“…The ECPSSR theory of Brandt and Lapicki (1981) is a very successful model in describing the ionization by light ions, such as protons (Lapicki, 2002). This theory is a modification of the Plane Wave Born Approximation (PWBA).…”

Section: Introductionmentioning

confidence: 99%

K X-ray production by 12C4+ ion impact on selected elements

Lucio

Miranda

Rodrı́guez-Fernández

2005

Radiation Physics and Chemistry

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“…We also analyze the ionization of specific deep shells of Ar (K and L). In figure 2 we display these results and compare with the ECPSSR predictions [6] obtained with the ISICS11 code by Cipolla [7], and with the coupled-state results for L-shell ionization by Martir et al [8]. …”

Section: Related Contentmentioning

confidence: 79%