Ionization collision dynamics in 3.6 MeV/u Ni24+ on He encounters
1995; Elsevier BV; Volume: 98; Issue: 1-4 Linguagem: Inglês
10.1016/0168-583x(95)00150-6
ISSN1872-9584
AutoresJ. Ullrich, Robert Moshammer, M. Unverzagt, W. Schmidt, P. Jardin, R. E. Olson, R. Dörner, V. Mergel, H. Schmidt‐Böcking,
Tópico(s)Ion-surface interactions and analysis
ResumoThe momentum balance between all emerging particles (electron, recoil ion and projectile) was explored for single ionization of helium by 3.6 MeV/u Ni24+ impact in a kinematically complete experiment. Technically this was achieved by integrating a novel 4π low-energy electron analyzer into a high-resolution cold-target recoil-ion momentum spectrometer. More than 90% of the “soft electrons” (0 eV ≤ Ee ≲ 50 eV) are ejected in forward direction with a most probable longitudinal energy (along the ion-beam) of Ee⊥ ≈ 3 eV. Not the projectile, but the backwards ejected recoil-ion (ER⊥ ≈ 0.4 meV) compensates the electron longitudinal momentum except of a small contribution from the inelasticity of the reaction. Energy losses of the 0.2 GeV projectiles as small as ΔEpEp = 3.4 × 10−7, transverse momentum balances, as well as electron energy and angular distributions for defined final recoil-ion charge state become accessible with this technique.
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