Coincidence studies of capture and ionization in highly charged I q + -He and U <mml:mrow…
1990; American Physical Society; Volume: 41; Issue: 7 Linguagem: Inglês
10.1103/physreva.41.3559
ISSN1538-4446
AutoresS. Datz, R. Hippler, Lars H. Andersen, P. F. Dittner, H. Knudsen, H. F. Krause, P. D. Miller, P. L. Pepmiller, Thomas M. Rosseel, R. Schuch, N. Stolterfoht, Y. Yamazaki, C. R. Vane,
Tópico(s)Advanced Chemical Physics Studies
ResumoElectron capture and ionization processes were investigated for ${\mathrm{I}}^{\mathit{q}+}$-He and ${\mathrm{U}}^{\mathit{q}+}$-He collisions at incident energies 0.1--1.0 MeV/nucleon and for incident charge states q=5--44. Cross sections for single-electron capture, transfer ionization, single ionization, and double ionization were obtained using a projectile-ion recoil-ion coincidence technique. A pronounced interplay among the different electronic processes was observed. Cross sections for single ionization show a rather weak charge-state dependence, in disagreement with recent calculations of McKenzie and Olson [Phys. Rev. A 35, 2863 (1987)]. In a second experiment, photon recoil-ion coincidences were measured to obtain partial cross sections for capture into certain projectile n states. These measurements provide strong evidence that transfer ionization populates lower projectile n states than does single-electron capture. Zero-degree electron spectroscopy, coincident with charge capture for 0.5 MeV/nucleon ${\mathrm{U}}^{30+}$ projectiles revealed that the free electron in transfer ionization is released from the projectile to its continuum and from high-lying Rydberg states of the projectile.
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