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New experimental data on the charge-state (q) evolution fractions Fq(D) and equilibrium charge-state fractions Fq-infinite are presented when 2.65 MeV/u C2+, O3+, Ne4+ and Si5+ projectile ions passed through carbon foils with thickness of D = 10–200 micro-g/cm2. The equilibrium fractions Fq-infinite for Si + C collisions (i.e. for silicon ions colliding with carbon foils) are compared with the data at 4.3 and 6.0 MeV/u previously reported, and the observed significant difference is explained by different energy dependencies of the electron-capture and
projectile-ionization cross sections. Detailed information about nl-state distribution functions Nq(nl) of exit silicon ions is obtained for these three energies by solving linear balance equations for Nq(nl) values where n and l are the principal and orbital quantum numbers, respectively, and Sigma_nl[Nq(nl)] = Fq-infinite. The collision cross sections and radiative decay rates as the coefficients of these balance equations are calculated for each ion-beam energy.
Based upon the present method, it is found that the fractions of excited Si ions after the carbon foil are about 57%, 33% and 15% at energies of 2.65, 4.3 and 6.0 MeV/u, respectively, clearly indicating the significant reduction of the excited-ion component with the collision energy increasing. The calculated equilibrium charge-state fractions F1qfor Si ions are in good agreement with available experimental data.
雑誌名
Nuclear Instruments & Methods in Physics Research Section B
Distribution of exit silicon ions over excited states after penetrating through carbon foils at 2.65, 4.3 and 6.0 MeV/u
