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He ion-induced L x-ray emission cross sections of ytterbium

Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN: 0953-4075, Vol: 30, Issue: 24, Page: 5693-5700
1997
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Measured L x-ray ionization cross sections for He bombardment of Yb in the energy range 1.0-8.5 MeV are compared with the ECPSSR theory. Significant discrepancies between theory and experiment are observed at an incident beam energy below about 5 MeV. The discrepancies are greatly reduced by the inclusion of collision-induced intrashell coupling (ECPSSR-IS) and modifications of the binding factor in the theory in the united atom picture (ECPSSR-IS-UA). More specifically, in this case of Yb L-shell ionization by energetic He ions, the contribution of L-subshell coupling towards better agreement with the theory is more significant than binding energy correction.

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