Electron-impact ionization cross-section measurements for U 1 0 + , U 1</mml:…
1990; American Physical Society; Volume: 41; Issue: 1 Linguagem: Inglês
10.1103/physreva.41.106
ISSN1538-4446
AutoresD. C. Gregory, M. Saiful Huq, F. W. Meyer, D. Swenson, M. Sataka, S. Chantrenne,
Tópico(s)Ion-surface interactions and analysis
ResumoAbsolute measurements are presented for electron-impact single ionization of ${\mathrm{U}}^{10+}$, ${\mathrm{U}}^{13+}$, and ${\mathrm{U}}^{16+}$, and for double ionization of ${\mathrm{U}}^{10+}$ and ${\mathrm{U}}^{13+}$ from below the thresholds to 1500 eV. Metastable components are observed in all three incident-ion beams. The single-ionization cross sections are enhanced due to indirect ionization processes by factors of 4--20 near their peaks, and the double-ionization cross sections are apparently also dominated by indirect ionization. Good agreement is found with distorted-wave calculations for total ionization of ${\mathrm{U}}^{16+}$, the only case where detailed calculations are available for comparison. Individual or closely spaced resonances are clearly resolved in the single-ionization channels for ${\mathrm{U}}^{13+}$ and ${\mathrm{U}}^{16+}$.
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