L-subshell ionization of heavy elements by S ions with energy of 0.4–3.8 MeV/amu
- 作者：I. Fijał ; -Kirejczyk ; M. Jaskó ; ł ; a ; A. Korman ; D. Banaś ; J. Braziewicz ; J. Choiń ; ski ; U. Majewska ; M. Pajek ; W. Kretchmer ; G. Lapicki ; T. Mukoyama ; D. Trautmann
- 关键词：L-shell production and ionization cross sections ; X-ray ; Multiple ionization
- 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
- 出版年：2008
- 期刊代码：42_0168583x
- 类别：ph
- 出版时间：May 2008
- 卷：266
- 期：10
- 页码：2255-2258
- 文件大小：551 K
摘要
The L-shell X-ray production cross sections have been measured for sulphur ions in the energy range of 12.8–120 MeV for Au and Bi elements. The experimental L X-ray spectra were analyzed using the method that takes into account the multiple ionization in outer shells. The L-subshell ionization cross sections have been obtained from measured X-ray production cross sections for resolved L
1,2 Lγ1 and Lγ2,3 transitions using the L-shell fluorescence and Coster–Kronig yields modified by the multiple ionization effects in the M and N shells. The results are compared with the predictions of ECUSAR theory, which is the modified ECPSSR approach describing both direct ionization and electron-capture processes and the semiclassical approximation (SCA) calculations for direct ionization. These approaches were modified by the L-subshell coupling effects within the “coupled-subshell model” (CSM). Both modified approaches are in good agreement with the data. Remaining discrepancies are discussed in terms of the L-shell decay rates modified for the multiple ionization effects.
1,2 Lγ1 and Lγ2,3 transitions using the L-shell fluorescence and Coster–Kronig yields modified by the multiple ionization effects in the M and N shells. The results are compared with the predictions of ECUSAR theory, which is the modified ECPSSR approach describing both direct ionization and electron-capture processes and the semiclassical approximation (SCA) calculations for direct ionization. These approaches were modified by the L-subshell coupling effects within the “coupled-subshell model” (CSM). Both modified approaches are in good agreement with the data. Remaining discrepancies are discussed in terms of the L-shell decay rates modified for the multiple ionization effects.