量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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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
