L-subshell ionization of Ce, Nd, and Lu by 4e280 10-MeV C ions

G. Lapicki, A. C. Mandal, S. Santra, D. Mitra, M. Sarkar, D. Bhattacharya, P. Sen, L. Sarkadi, D. Trautmann

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Abstract

Ll, L, L, L, L1+5, L2+3, L4+ x-ray production cross sections of Ce58, Nd60 and Lu71 induced by 4-, 6-, 8-, and 10-MeV carbon ions were measured. For Lu, L+3 is separated from L32+3+6 after revision of the technique of Datz so that L1+5 was used instead of L31, the L4+ L1+5 ratio was corrected for multiple ionization, and uncertainties in L4+ were incorporated in the fitting process. L-subshell ionization cross sections were extracted as a weighted average from two combinations of these cross sections, {L,L1+5,L2+3} and {L1,L1+5,L3}. It is shown that, to within a few percent, the first of these two combinations results in the identical cross sections as this weighted average. Within 10%, permutations of different sets of single-hole atomic parameters yielded the same ionization cross sections. These cross sections are typically within 15% and at most 35% of the cross sections obtained with atomic parameters that were altered in two different ways for multiple ionization. Extracted subshell and total L-shell ionization cross sections as well as Ce and Nd data of Braziewicz are compared with the ECPSSR theory of Brandt and Lapicki that accounts for the energy-loss (E), Coulomb-deflection (C), perturbed-stationary-state (PSS) and relativistic (R) effects. These measurements are also compared with the ECPSSR theory after its corrections in a separated and united atom (USA) treatment, and for the intrashell (IS) transitions with the factors of Sarkadi and Mukoyama normalized to match L-shell cross section with the sum of L-subshell cross sections as well as with the similarly improved semiclassical approximation of Trautmann. For Ce and Nd, the agreement of the extracted ionization cross sections with these theories is poor for L1 and good for L2, L3, and total L shell ionization. For the L2 subshell, this agreement is better for Ce and Nd than for Lu. The ECPSSR theory corrected for the USA and IS effects is surprisingly good for the L1-subshell ionization of Lu, while at MeV a similarly corrected semiclassical approximation is in excellent agreement with L2 and L3 data but overestimates the L1 measurement by almost a factor of 2.

Original languageEnglish
Article number022729
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume72
Issue number2
DOIs
Publication statusPublished - Aug 1 2005

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Lapicki, G., Mandal, A. C., Santra, S., Mitra, D., Sarkar, M., Bhattacharya, D., Sen, P., Sarkadi, L., & Trautmann, D. (2005). L-subshell ionization of Ce, Nd, and Lu by 4e280 10-MeV C ions. Physical Review A - Atomic, Molecular, and Optical Physics, 72(2), [022729]. https://doi.org/10.1103/PhysRevA.72.022729